New Nomenclature for Eclipses, Transits and Occultation: Observer Oriented Approach

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 10 Issue: 07 | July 2023 www.irjet.net p-ISSN: 2395-0072
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New Nomenclature for Eclipses, Transits and Occultation: Observer
Oriented Approach
Mitali Kabra1, Sudarshan Loya2
Abstract - Humans are soon going to inhabit different
celestial bodies, one of them being moon. The eclipses on
Earth will seem different on the moon. For example, when a
Lunar Eclipse occurs on the earth, it will be a Solar Eclipse
on the moon. So, even though the celestial arrangement is
same, when the observer’s position is changed, the entire
phenomenon gets changed. Eclipses, transits and
occultation are also used by astronomers to find details
about celestial bodies. It is important to clearly name the
arrangement to explain the syzygy and its meaning. This
paper is an attempt to review the current as well as possible
new astronomical phenomena and name them precisely
keeping the observer’s position in mind.
Scientists have been discovering new, different and quirky
systems. So, there may be a possibility of various other types
of events occurring, that one may not have even imagined. It
is necessary to look into such possibilities from
mathematical point of view and name it, so that
astronomers can use them to make their mathematical
models for exo-planet and exo-moon hunting more precise.
A new system is defined in here to name the possible
eclipses, transits and occultation, such that any new
development can be properly explored and classified. Even
though authors have covered a wide range of eclipses and
occultations, authors believe this may not be the end of the
road.
Key Words: Eclipses, Occultation, Exoplanets,
Nomenclature, Syzgy, Observer Oriented.
1. INTRODUCTION
Modern astronomy is filled with many wonders and
discoveries of amazing Exoplanets, exomoons and stellar
systems which are very different from that of ours [1]–[6].
These discoveries of Exoplanetary system along with their
shapes, sizes and orbits shows that universe is filled with
stellar systems which cannot be comprehended by any of
the human’s current analytical or imaginative models. In
light of such amazing discoveries, one can wonder not only
about the planetary systems; but kind of syzygy they can
create. Such arrangements of planets, its natural satellite
need to be studied in detail, but before that they need to
be classified.
Most people on earth are aware of two kinds of eclipses:
Solar and Lunar eclipse [7], [8]. These eclipses have not
only shaped our scientific understanding but also our
cultural and religious beliefs[9]. But modern day
discoveries demand a new classification not just for
eclipses but also for transits and occultation. These
classifications and nomenclatures need to be observer
position dependent as human beings or spacecrafts are no
longer bound to earth or just our solar system and in
future may observe such phenomena from other bodies.
This effort will make the nomenclature universal and
usable by future generations.
So, this paper aims to provide an insight about possible
eclipses, transits and other phenomena occurring on
celestial bodies, while taking into consideration the position
of the observer. The ideas explained in here are using
simple mathematical equations developed from similarity
of triangles. Even though dwelling into a more detailed
mathematical expression is not possible at this time, the
ideas presented here, are very much valid and surely have
greater scope.
1.1 Naming from Observer’s Point of View:
Many space agencies are planning to create a permanent
settlement on the moon by 2035 [10], [11]. The people
inhabiting the moon will see the eclipses that occur on
earth in a completely different way. In such a scenario, one
should take into consideration the position from where the
observer may be watching the phenomenon. Because, the
eclipses that take place on the earth, are named
considering the observer's position to be Earth; so, while
discussing eclipses, transits and occultation on other
celestial bodies, it is important to identify the observer
position.
When there is a lunar eclipse on the Earth, it won't
be a lunar eclipse on the Moon. It would be a solar eclipse
on the Moon, but to make the observer’s position clear,
scientists have named it as a solar eclipse on the moon [12],
[13]. Similarly when there is a solar eclipse on earth, the
near side of the moon facing the earth, may see a small
black spot moving across the surface of the earth. Though
this will not be an eclipse, it will be more of black spot or
shadow transiting the earth and hence should be named as
Self transit (moon on earth). When the shadow of the body
1Crux View Center, Sagar Trade Center, Jalna Road, Aurangabad
2AdjunctProfessor,Deogiri Institute of Engineering & Management Sciences, Station Road, Aurangabad
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itself is creating a spot on another celestial body which is
visible from the original body, it should be named as self-
transit.
Even though the astronomical arrangement is the same, by
changing the position of the viewer, the appearance and
viewing of the eclipse is changed. Hence it is important to
consider the observer’s position, and name the
astronomical phenomenon accordingly.
1.2 Planet Transits:
On earth, planetary transits are visible through special
equipments [14], [15]. When Venus or Mercury move in
front of the sun with respect to earth, they can be seen as a
small black dot over sun surface using telescope with solar
filters[16]. Such events are called transits and not eclipses
[17], [18]. The naming or identification of most transits or
eclipses is from earth’s point of view. But as explained
before, it is important to consider other points of
references like Mars, Io, etc. Not just transits, even
occultation need to be reclassified based upon observer’s
point of view.
2. OCCULTATION:
Occultation is a phenomenon which occurs when an object
or celestial body passing in front of another object blocks
or covers it partially or completely[19], [20]. Occultation is
a commonplace occurrence in the night sky on earth with
respect to stars or other planets being blocked by the moon
[20]–[22]. However, on other planets occultation of one
moon by another would be quite a view to behold. Some of
these occultation’s have been picked by on-board cameras
of various space probes on different planets as discussed
below [23]–[26]. But before discussing occultation in great
detail, one needs to clearly differentiate occultation and
transits.
As defined by NASA when a smaller object passes in front
of a larger object, such that only a small part of the larger
object is blocked, then it should be called a transit and not
an occultation [27], [28]. For the arrangement to be called
occultation, the body eclipsing the far away celestial object
has to be apparently bigger in size from observers point of
view [28], [29]. So when the object closer to the observer
has a bigger apparent size as compared to the far away
object, the phenomenon will be called occultation. Body in
front may or may not cover the entire body behind it or
may not be actually bigger than the body behind it, but it
just has to appear bigger from the observer's position. If
the body in front is appearing smaller from an observer's
point of view, the occlusion will be called transit.
But in case of other planets which have multiple moons, the
moon close to the planet can be big enough to completely
block the other moon behind it and it can be visible by
unaided eyes like that happening on planet Mars [19], [25],
[28], [30]. Such a phenomenon is called occultation in
literature. Although transit and Occultation are used
commonly in literature, most of them are defined with
respect to earth [20], [27], [31]–[38].
As most of the astronomical studies are done with respect
to earth, authors have provided the history of occultation
that are regularly observed by scientists [39]–[43]. Lunar
occultation occurs when the moon is blocking the other
celestial body [44]–[46]. It is the most observed occultation
and may be observed even from unaided eyes. Asteroid
Occultation is when an asteroid passes in front of a star
with respect to earth [47]. Planetary Occultation happens
when a planet from the solar system passes in front of
other stars with respect to earth [43], [48], [49]. This has
been used by scientists to understand the makeup of the
planet's atmosphere like that of Pluto even before the
spacecraft could have reached there. Lastly, Artificial
Occultation is when a man-made object is used to block
certain objects' visibility to study things in background or
at the surface [50].
Scientists in the past have used space probes to see
occultation on other planets not just in visible light but also
in the UV, IR and radio spectrum [51], [52]. These have
helped them to evaluate the ring structure of Saturn as well
as shapes and sizes of various objects on other planets [33],
[53]–[55]. Occultations of stars by planetary rings, planets,
asteroids are called Stellar occultation[52], [55]–[60]. But
this definition is confusing. As an asteroid occultation is
also an asteroid passing in front of a star and so is stellar
occultation. Same with planetary occultation as the planet
passes in front of the star.
As the human race is no more limited to the planet earth
but trying to colonize other planets which have multiple
moons, occultations will be more frequent. Using advance
space probe and rovers, astronomers have discovered
various other kinds of occultation. Hence it is of utmost
importance to classify occultations not just with respect to
earth but in common sense which identifies the position of
the observer as well as bodies taking part in the
occultation.
For example, Mars is an active planet for planetary
observation as there are some advanced robotic probes
working live on that planet [25], [61]–[63]. As seen by
NASA Curiosity rover that On August 1st 2013, Phobos can
occult Deimos and block the visibility of Deimos from
certain positions on Mars [64]. As Phobos is apparently and
actually bigger than Deimos while moving in front of it,
such an event is called lunar occultation as observed from
Mars as shown in Figure. When observed from Deimos,
Phobos passing in front of Mars will be a lunar transit. Even
on Saturn, a man made space probe Cassini Huygens has
observed Saturn’s moon Rhea occulted by Dione with
respect to probe [65]–[69]. Even though this image does

not provide an observation of occultation as viewed from
Saturn, it provides evidential support.
Figure 1: Lunar occultation of Deimos by Phobos on Mars
The authors are trying to provide a uniform nomenclature
to all kinds of occultation and transit. But the
nomenclature should be able to differentiate them clearly
suggesting the observer position along with bodies
involved in the process so as to understand and
communicate precisely.
2.1 Nomenclature:
Building upon existing pattern, with slight modifications
one can describe the phenomenon precisely from observer
location. In the current nomenclature system, it is a
common practice to identify transit or occultation by the
object in between two bodies. For example, moon is the
middle body in lunar occultation. So is the case for other
occultations. The only exception is stellar occultation
which is named after the star which is occulted by the
celestial object in front. But since stellar occultation can
also be defined in terms of other occultations, as explained
before, authors believe that one should not use the name,
stellar occultation anymore.
Following the above example on the Martian planetary
system, Phobos occultation of Deimos from Mars, will be
named as lunar occultation. But whenever this
phenomenon is broadcasted or discussed on earth or any
other celestial body, then the name needs to be more
precise so that it can specify the celestial bodies taking
part in the occultation and their arrangement. Hence, the
name should be followed by a bracket, which will specify
the celestial bodies taking part in the occultation.
So the name in a generalized way will follow the following
pattern-
Type of occultation (The position of the observer -The
body that is occulting - The body that is being occulted).
The same method can also be applied for already defined
occultations and transits with respect to earth. The
following list provides examples of various occultations as
well as transits, being classified and named as discussed
above.
Table 1: Occultation and Transit Classification:
Sr.
No
Occultat
ion Type
Example Nomenclature
1. Lunar
Occultat
ion
1. Phobos between
Mars and Deimos
and observer at
Mars
2. Callisto between
Ganymede and Io
and observer at
Ganymede
(Hypothetical
arrangement to
explain that even
one moon can come
between two other
moons)
1. Lunar
occultation
(Mars -
Phobos -
Deimos)
2. Lunar
Occultation
(Ganymede -
Callisto - Io)
2. Asteroid
occultati
on
1. Asteroid Pallas
occulted star
Vulpecula as
viewed from earth
[70]
2. Asteroid 163
Erigone occulted
stars Regulus
viewed from Earth
[71]
1. Asteroid
Occultation
(Earth -
Pallas -
Vulpecula)
2. Asteroid
Occultation
(Earth - 163
Erigone -
Regulus)
3. Planetar
y
Occultat
ion
1. Planet Venus
occulting Xi-2
Sagittarii when
viewed from earth
[72]
2. When Deimos is
occulted by Mars
from Phobos.
3. Planet TRAPPIST-1
b is occulted
TRAPPIST-1 c when
viewed from earth
[73].
1. Planetary
Occultation
(Earth -
Venus - Xi-2
Sagittarii)
2. Planetary
Occultation
(Phobos -
Mars -
Deimos)
3. Planetary
Occultation
(Earth -
TRAPPIST-1 c
- TRAPPIST-1
b)
4. Artificial
Occultat
The Sun disk was
occulted by Apollo
Artificial
Occultation

ion Spacecraft when
viewed from Soyuz
[74].
(Soyuz - Apollo -
Sun)
5. Self-
Transit
1. When there is a
solar eclipse, the
view from the
moon will be of a
self-transit.
2. Similarly, when
Callisto eclipses
Jupiter, the view
from Callisto will be
of self-transit.
1. Self-Transit
(Moon On
Earth)
2. Self-Transit
(Callisto On
Jupiter)
6. Planetar
y transit
1. When Venus or
Mercury move in
front of the sun
with respect to
earth [19]
2. When mercury
passes in front of
sun with respect to
Mars [75]
1. Planetary
Transit (Earth
- Venus - Sun)
2. Planetary
Transit (Mars
- Venus - Sun)
7. Lunar
Transit
1. Phobos transiting
in front of Sun as
viewed from Mars
[76], [77]
2. Deimos transiting
in front of Sun as
viewed from Mars
[78]
1. Lunar Transit
(Mars -
Phobos - Sun)
2. Lunar Transit
(Mars -
Deimos - Sun)
8. Artificial
Transit
1. The ISS transits the
Sun as viewed from
Earth [79]
1. Artificial
Transit (Earth
- ISS - Sun)
9. Asteroid
transit
1. Halley’s comet
transits the sun
when viewed from
earth [80]
2. C/1819 N1 transits
the sun when
viewed from earth
[81]
1. Asteroid
Transit (Earth
- Halley’s
comet - Sun)
2. Asteroid
Transit (Earth
- C/1819 N1 -
Sun)
3. OTHER KINDS OF ECLIPSES:
Apart from occultations, there are possibilities for new
kinds of eclipses that may occur on other planets if not on
earth. In recent times, astronomers have discovered
different kinds of planetary systems, which are nothing like
our own solar system[32]. For example, in the planetary
system of Kepler 1625; the planet orbiting Kepler 1625 i.e.
Kepler 1625 b is really big compared to anything in our
solar system [82]–[84]. Such big planets are commonplace
occurrences in other planetary systems as observed in
various scientific observations [85], [86]. Keplar 1625 b is
supposed to be orbited by a moon Kepler 1625 b I [87],
[88]. The astronomers are trying to figure out if the moon
has its own moon or there is a different arrangement
working on that star [89]–[91]. If this is true, it will give
rise to new sets of eclipse and transits.
New astronomical data has found astronomical objects
earlier thought to be impossible [92]. On a planetary
system having dwarf stars with super Jupiter-like planets
orbiting them, they can cast shadows at much longer
distances, like the GJ3512 or the WD 1856+534 stellar
system [93]–[99]. Can such planets cast an eclipse on
another planet? Given the amazing discoveries
astronomers are making on a daily basis, no arrangements
can be ruled out, just because astronomers haven’t
observed them yet.
3.1 Eclipses on One Planet by Other Planet:
Eclipses by the moon of a planet on the planet itself are
very common, but even a planet can cause an eclipse on
another planet. Normally, a planet can only be visible as a
bright star from another planet in the night sky, however
big the planet can get before it hits the limit of turning into
a star or playing tug of war with the original planet [100].
But discoveries of the Exoplanets, their
diameters and the diameter of the star they are orbiting
around raise some questions. Discovery of TRAPPIST 1
stellar system recently showed that planets can orbit so
close that they can actually appear like the moon from
other planets in the same stellar system [101], [102]. Also,
when one planet's orbit is too eccentric around a star, on
another planet; it can appear slightly bigger than a pointed
star in the night sky. Like in the system of HR5183, HD
80606 or HD 20782, the orbit of the respective planet is
very eccentric like that of a comet [103]–[107]. Recent
simulation done by Kane, S, Blunt and others shows that
when viewed from a rocky planet in the habitable zone of
the host star, such a planet can appear a little bit bigger like
a small ball shaped in the night sky [103], [104].
But to discuss the possibility, one can work with some
basic conventions of shadow formation by light. For any
shadow to be casted at a large distance, one can use the
principle of light and its effect on solid bodies. The light
source needs to be smaller with respect to the object and
the object should be closer to the source to create a longer
shadow when no other light sources are present nearby.
So, it is quite clear that Super-Jupiter will have the longest
shadow in any stellar system. Further, the shadow of such a

super Jupiter can reach even longer, if the host star is a
dwarf star which has a diameter comparable to that of
super Jupiter. Given that in our solar system, the Sun is too
large, the possibility of viewing the sun as a pointed star or
small object is fairly small even from very large distances.
So to see a planet big enough to cover the sun is quite
impossible in our solar system and in most solar systems.
But one needs to study other solar systems keeping the
above ground rules in mind.
Figure 2: Possibility of planet to planet eclipse on
imaginary planet in GJ 3512 system.
Recently, astronomers have discovered one such system,
GJ3512 around 31 light years away from earth; in which
the Exoplanet GJ3512b is nearly the same size as the host
star [97], [108]. So given the scenario, the shadow cast by
GJ3512b will be very large and may reach at distances
where other planets can orbit. Astronomers recently
discovered second planet orbiting the same star but it is
yet to be confirmed by secondary sources. This planet is
orbiting at about 1.3 AU from its star. Since the prediction
of another planet orbiting the star GJ 3512 is not yet
validated, let’s assume a hypothetical planet at a distance of
149,600,000 km or 1AU in the same plane as the first
planet [109], [110]. And let the planet be called GJ3512ci
where ‘i’ stands for imaginary planet. Performing simple
math of triangles to find out the shadow distance, one can
check out the possibility of the eclipse on the hypothetical
planet by GJ3512ci.
Here, left hand side circle is the star GJ3512, middle one is
the planet GJ3512b whereas on the right hand side is the
imaginary planet GJ3512ci.
Point A is at the circumference of the star GJ 3512.
Point B is the location of GJ 3512b from the star position
Point C is the circumference of the GJ351b
Point D is the location of GJ3512ci from the star position.
Point E is on the circumference of GJ3512ci
Radius of GJ3512 = 0.166 *Radius of Sun ~= 115500
km [111]
(1)
Radius of the GJ3512b = 1.27 *Radius of Jupiter~=
88800 km
(2)
Orbital Radius of GJ3512b = 0.338 AU = 0.338 *
149600000= 50565000 km
(3)
Distance of GJ512ci from GJ3512b = Distance from
Earth from Sun = 1AU
(4)
Since △ABC is similar to △ ADE by AA test, one can
write the ration of lengths are equal.
AB:AD::BC:DE (5)
0.338/1=(115500-88800)/DE (6)
DE= 1*26700/0.338 (7)
DE = 79000 km. (8)
From Equation (8), the value DE is 79000 km, i.e. smaller
than the radius of GJ3512 which is 115500 as shown in
equation (1).Therefore, the light has not yet crossed the
midpoint of GJ3512ci. Thus the shadow of the super Jupiter
planet GJ 3512b can reach the planet in the Umbra region
itself. In such a scenario, there is a possibility of having a
planet - planet eclipse.
Another interesting example is of the stellar system WD
1856+534, a white dwarf star about 80 light years away
from earth. This stellar system has a planet WD1856b
which is about 10.4 times the radius of earth [94], [95],
[112]. Comparing the radius of the planet and star will
suggest that the planet's diameter is bigger than that of its
host star.
Radius of WD1856 star = 0.013 * Radius of sun =
0.013*695700 ~=9044km
(9)
Radius of WD1856b = 10.4 *Radius of earth =
10.4*6378 ~= 66000 km
(10)
Hence the planet can virtually block the star and cast a
shadow long enough that any other planet in the system
will definitely experience a planet to planet eclipse.
Even though the above two examples are based upon an
imaginary second planet, soon astronomers may find out a
stellar system that exists with multiple planets. Hence, a
proper naming system of such eclipses will be needed
based upon the host star and two planets involved.

Apart from the above scenario where the two planets have
separate orbits, a stellar system can exist, where two
planets orbit each other with Barycenter somewhere
between them. Like, there are stellar systems with two
stars orbiting each other commonly called a double star
system [113], [114]. Also, in our own solar system, Pluto
and Charon are referred to as binary planetary systems
[115]. So, it is highly possible to detect a stellar system
where one will be able to detect two planets orbiting each
other as binary systems. In such a scenario, it will be even
more possible to have one planet eclipsing another planet
due to their proximity and orbital motion. Following figure
illustrates the same in a simple possible way.
Figure 3: Possibility of planet to planet eclipse on an
imaginary dual planet system like Pluto and Charon.
3.2 Eclipses on One Moon by another Moon:
There are other kinds of eclipses, in which one can see
some evidence in our solar system. One of them is the
eclipse of a moon by another moon. As discussed earlier,
both moons of Mars can cause occultation with respect to
Mars (Phobos-Deimos occultation) and also they have
transited the sun with respect to Mars individually [116].
That means both the moon may also come in a straight line
with respect to the Sun.
Various telescopic images prove that all four Galilean
moons of Jupiter can create solar eclipses on Jupiter [117]–
[121]. Out of the four main Galilean moons, the largest two
moons Ganymede and Callisto are having approximately
the same inclination i.e. 0.204 and 0.205 respectively
[122]–[124]. Since both the moons are orbiting in the same
plane and they can both eclipse Jupiter, that means Callisto
can also eclipse Ganymede, when they are both passing in
front of Jupiter at the same time in a straight line.
Some unpublished sources have claimed to have seen Io
casting shadows on another moon Ganymede [125]–[127].
Although there are multiple reports of these, authors have
not yet found any published source on the same, but just
one article in newspaper[128]. But this gives credence to
the above theory.
Figure 4: Possibility of Io eclipsing Ganymede (both moon
of Jupiter) as claimed in paper Washington Post
Not just on the moons of Jupiter, but such an eclipse can
occur on other planets where the moons are orbiting
around the planets very near to their ecliptic plane. For
example, moons of Uranus namely Ariel and Umbriel are
going around at very small angles to the ecliptic plane
[123], [129], [130]. Authors do understand that the
Uranus axis is tilted and the moon of Uranus can never
come in a straight line along with the sun to cause any
eclipse. But in special case, if there is a planet like Uranus,
whose axis is not tilted and has moons similar to Umbriel
and Ariel, moving in same plane and about same distance
from the planet, it is very likely to cause a moon eclipsing
another moon. Just to figure out the possibility of the same,
authors are employing simple math on the triangles as
shown in figure.
Figure 5: Top view of the solar system with the Sun,
Uranus and its two moons Ariel and Umbriel in a system
where Uranus is not tilted.
Point A is at the circumference of the star i.e. our Sun.
Point B is the location of Uranus Moon Umbriel on the
tangent of the sun circumference
Point C is at the location of Uranus Moon Ariel on the
tangent of the sun circumference
Point D is the location of Ariel on side of Uranus when
facing the Sun
Point E is the location of the Umbriel in front of Ariel
Radius of Sun ~= 696340 km [131] (11)
Radius of the Ariel ~= 1158 km [132] (12)
Radius of Umbriel ~= 1170 Km [133] (13)
Semi Major axis distance of Ariel from Uranus
~=191020 Km
(14)

Distance of Uranus from Sun = 2954100000 Km (15)
Semi Major axis distance of Umbriel from Uranus
~=266300 Km
(16)
Figure 6: Ariel Eclipse of Umbriel in an imaginary system
where Uranus is not tilted
From the above discussion one can figure out the position
of the Uranus moon Umbriel from Ariel by considering the
right angle triangle DEF.
In triangle DEF, ∟EDF is right angle and hence by
Pythagoras Theorem, one figure out the distance DE as DF
is semi major axis distance of Ariel from equation (14) and
EF is semi major axis distance of Umbriel from equation
(16).
DE=√(EF2 - DF2) = √(2663002 - 1910202) =
185545 km
(17)
Considering the Error! Reference source not found., the shadow
of Uranus moon Umbriel will be shortest from the light
coming from the opposite hemisphere of the Sun. Hence,
the figure was modified to check if the shadow of the
Umbriel will ever reach Ariel.
From , △DCE and △DBA are similar. Hence their sides have
to be in equal ratio.
AB= Radius of Sun + Distance of Ariel from Uranus
EC=Radius of Umbriel - 1170 Km from equation (13)
AE=Distance of Sun from Umbriel is it in line with Sun and
Ariel. So, AE will be Distance of Sun from Uranus - Distance
of Ariel from Umbriel from equation (17).
AB= AO+OB = 696300+191020 = 887320 Km (18)
AE= AD-ED = 2954100000 - 185545 = 2953914455
Km
(19)
AB/CE=AD/DE (20)
887320/ 585=AE+DE/ DE (21)
1516.8DE-DE=AE (AE is Distance of Sun from
Umbriel = 2,953,914,455)
(22)
DE ~= 1,948,750 Km (23)
However the Ariel and Umbriel are at an inclination of
0.260 and 0.205 degrees from the Uranus plane
respectively. Calculating the offset of the moon from the
center line by using trigonometry ratios.
Figure 7: Exaggerated view of Arial and Umbriel tilt with
respect to ecliptic plane in an imaginary system where
Uranus is not tilted.
In the Error! Reference source not found., the inclination of
Ariel and Umbriel is exaggerated to make a point that the
moons may not be at the center line. The goal here is to find
the offset i.e. CD and AB to see if they are out of the shadow
cast by the front moon Umbriel on Ariel.
From the above figure, △ODC and △OBA are right angle
triangles at ∠OCD and ∠OAB respectively. Since the
hypotenuse is known in both the cases i.e. semi major axis
distance from Uranus and the angle of inclination is known
as discussed above, one can figure out the offset by using
Trigonometric Sin function.
CD = OD SIN(COD) = 266300* sin(0.205) = 952.8 Km (24)
AB = OB SIN(AOB) = 191020* sin(0.260) = 866.8 Km (25)

Since both the distances are nearly within a range of 100
Km which is way less than the radius of both moons i.e.
about 575 Km one can see that the moon-moon eclipse is
possible. The shadow of Umbriel i.e. 1948750 Km from
equation (23) is about 10 times the distance between
Umbriel and Ariel i.e. 185545 Km from equation (17).
Hence it is quite possible that even with the offset the
Uranus moon Umbriel may eclipse the moon Ariel.
Though this is not possible due to the tilted orbit of
Uranus, it suggests that such possibility can exists and may
occur on other planetary systems. Also, in other stellar
systems, there may be higher possibilities of such moon-
moon eclipses given that the moon sizes are bigger and the
star size is smaller.
3.3 Nomenclature:
Abovementioned eclipses need to be defined based upon
the celestial bodies involved in the phenomenon. On Earth,
eclipses are defined with respect to earth's observation of
celestial bodies and named by the object which is not
visible to the observer on earth. During lunar eclipse, Moon
is not visible and so is the case with sun during the solar
eclipse. However to avoid confusion, new eclipses should
be described in same way as occultation and transits were
named above.
In case of one planet eclipsing another planet, it should be
named as Planetary Eclipse by adding a bracket, clearly
describing the observer position, body causing the eclipse.
Here there is no need to mention the third body as it will be
source of light which will be the host star.
There can be two types of the planetary eclipses
depending on the observer’s position: when the observer is
on the planet that is eclipsing the other one, the eclipse will
seem like the lunar eclipse on the earth, but it won’t be a
lunar eclipse as the eclipse is of a planet. Such eclipses
should be called as Planetary eclipse. The second type is
when the observer will be on the planet that is being
eclipsed. It will be like the solar eclipse on the earth, so can
be named as Planetary Solar Eclipse.
The format of the name is: Planetary eclipse (observer
position - the second body in the arrangement). So: On the
stellar system GJ3512, the eclipse taking place will be
named as, Planetary Solar Eclipse (GJ3512ci-GJ3512b) if
the observer is on GJ3512ci, and if the observer is on
GJ3512b, it will be called Planetary Eclipse (GJ3512b-
GJ3512ci). Similarly, in the case of WD1856+534 eclipses
will be, Planetary Solar Eclipse (any planet, if found -
WD1856+534 b) or Planetary Eclipse (WD1856+534 b -
any planet, if found).
Similarly, in the case of Lunar Eclipse of one moon by
another moon, when the observer is on the moon that is
eclipsing, it will be called Lunar Eclipse only. When the
observer is on the moon that is being eclipsed, it can be
named as Lunar Solar Eclipse. In the case of Io eclipsing
Ganymede, observers from Ganymede will call it lunar
Eclipse (Ganymede-Io) and observers from Io will call it
Lunar Eclipse (Io - Ganymede).The same format can be
followed in other systems also.
4. FOUR CELESTIAL OBJECTS IN ONE LINE:
As discussed before, the Curiosity rover observed that
Phobos can occult Deimos and both moons can transit the
sun independently and that they all (Mars, Phobos, Deimos
and Sun) can come together in a straight line. This
phenomenon will be called a transit and not an eclipse as
the moons of Mars are not big enough to cast a shadow. But
if on some other planet or Exoplanets, where the moons
are big enough to cast a shadow, it is quite possible given
the range of Exoplanets astronomers have discovered
[134]. Like that happened and reported on the planet
Jupiter where Ganymede is casting shadow on Europa,
while the shadow of both is being casted on Jupiter at the
same time[128].
There may be a possibility of seeing multiple bodies
aligning in the same line, big enough to cast shadows which
will create an observation far beyond the explanation of
today’s terminology. These kinds of eclipses need to be
further classified and studied. One can classify these types
of eclipses on the basis of different arrangements of
celestial bodies involved in the eclipses. Since, the
discussion is about eclipses, alignment of small bodies
which cannot cast long enough shadows like asteroids,
rings, etc. are neglected.
4.1 Sun Moon –Moon Planet Syzgy:
Even though astronomers have not seen Sun-Deimos-
Phobos-Mars alignment, having four bodies in a straight
line that can create an eclipse is surely possible. As
suggested by the paper Washington post, Jupiter’s moons
Ganymede and Callisto can cast shadow on Europa or Io.
Astronomers have discovered eclipses by all the moons on
the planet individually. But since they all have nearly the
same small inclination angle (about 0.205), the possibility
of two moons coming in a straight line increases [135],
[136]. For a person standing on Jupiter at the right time
and right position can see a solar eclipse of two moons
occurring simultaneously. So while Callisto will be casting a
shadow on Jupiter, Ganymede or Europa can come in
between and provide an appearance of multiple Solar
eclipse. As the moon near the planet moves faster
compared to moons away from the planet, it is quite
possible; Ganymede or Europa can come in between and
add another layer of shadow.

Figure 8: Four body alignment creating multiple body
eclipse as imagined on Jupiter.
However for the above possibility, both the moons need to
be of appropriate sizes to cast shadows long enough to
reach the planet surface.
4.2 Sun Moon Planet Moon Syzgy:
On a planet with multiple moons, it is quite possible that
on one side of the planet; solar eclipse will be going on,
while from the other side, there can be a lunar eclipse
happening on another moon. The possibility of the sun,
both moons and the planet coming in a straight line is
quite obvious. On the planet, there cannot be a single site
from where one can observe both the solar eclipse and
lunar eclipse simultaneously. From the moon behind the
planet, one may never see the second moon in front of the
planet and observes the Sun, moon and planet in a straight
line. Same is true for the moon in between the sun and the
planet. At no single site on the moon, can one see the sun;
planet and the other moon align in a straight line. For
example, in the Jupiter planetary system, its moon Io and
Europa can have such an alignment. Since the possibility of
such an event is rare to be visible from a single point on
any of the body, there is no immediate need for naming
such an event. If discovered in future, the names will be
pretty obvious based upon other names given in the
sections below.
4.3 Sun Planet Moon Moon Syzgy:
It is a possibility that the Sun, the Planet, and its two
moons can come in a straight line leading to two solar
eclipses, when observed from the last moon. It is quite
possible that while a solar eclipse is going on, when
viewed from one moon, another moon orbiting closer to
the planet can come in between planet and moon. This will
create a four body eclipse when viewed from the first
moon. For example, when observed from Jupiter’s moon
Callisto, Jupiter can block the sun and cast a shadow on
Callisto. But at the same time, Ganymede at nearly the
same inclination can come in between Jupiter and Callisto
further creating an amazing view of multiple bodies
aligning at the same time. In this arrangement, the first
moon is covered by the shadow of the planet, and the
second moon is covered by the shadow of both the first
moon and the planet.
Figure 9: Four body Eclipse with planet eclipsing two
moons.
Similarly on Pluto, when looking from Nix or Styx, both
Pluto and Charon can come in between the moon and the
sun. The four bodies may be in alignment for a small time,
but it will be a sight to look out for.
Even though a wide range of new eclipses are discussed in
here, authors don't think that these will be the final
frontier. There are many more different phenomena yet to
be observed or named, but if it is possible physically or
mathematically, it is a matter of time before scientists
observe them.
4.4 Nomenclature:
Continuing with the same format discussed earlier;
following nomenclature is suggested for describing four
body eclipses to avoid any confusion. The names are given
with respect to view from the last body as the body in the
middle will have eclipses similar to one discussed earlier.
In any of the cases discussed, the observer from the last
body is going to observe two solar eclipses created by two
different bodies and hence it can be named as Twin Solar
Eclipses. However, it is also essential to identify on which
planet or moon the eclipse is taking place and the
arrangement of celestial bodies. Hence the following
nomenclature:
On the planetary system Jupiter, the arrangement of Sun,
Callisto, Ganymede and Jupiter should be represented as a
Twin Solar Eclipse on Jupiter (Callisto-Ganymede).
On the planetary system of Pluto, when the arrangement
of Sun, Pluto, Charon and Nyx come into play, it can be
called as Twin Solar Eclipse on Nyx (Pluto- Charon). The
same can be used for other planetary systems also without
changing the convention.
3. CONCLUSIONS
The discovery of different types of Exoplanets and
exomoons orbiting various kinds of big or small stars may
result in different, new and interesting kinds of eclipses or
transits being observed in future. So it is necessary to do
their identification and classification. Such scenarios may
provide a perspective about the motion of planetary
systems in the future. Since astronomers have discovered
exoplanets of various shapes, sizes that orbits around
different kinds of stars, discovery of the exomoons will
further add spice to the entire viewing profile.

So based upon various observations till now, authors have
extrapolated some scenarios and try to classify various
eclipses, occultations and transits. With the technological
advancement, these phenomena will be broadcasted live
in future from other planets as fast as possible to create
awareness among the space enthusiastic community.
Hence identifying and naming them is important.
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