Find the local apparent solar time for the current location and date:

It is close, but not equal, to the current civil time:

Solar time is returned as an angle in mixed units of right ascension:

Convert to angular degrees:

Find the current apparent solar time for your location:

It can also be computed as follows:

Find the current mean solar time for your location:

Find the current value of the equation of time for your location:

It is defined as the difference between true solar time and mean solar time:

Use locations in different formats:

Specify dates as DateObject expressions or date lists:

For a given location and date, solar time can also be computed from AstroPosition:

Locations with the same longitude have similar solar time:

Each 15 degrees of longitude correspond to about one hour of solar time:

Solar time is not defined at the poles, because longitude is not uniquely defined at the poles:

Mean solar time for Greenwich was the basis for GMT time:

However, it does not coincide in general with true solar time at Greenwich:

Take a city in West China:

This is the current time at that location, with the unique time zone GMT+8 used in China:

It is shifted by more than two hours with respect to the corresponding solar time:

Take a location and a date:

Compute the sidereal time of the antipode of that location, for that date:

Compute the right ascension of the Sun for that location and date:

Then the solar time is equivalent to this difference, modulo full angles:

The equation of time, defined as the difference between apparent and mean solar times, varies during a year:

Find the minimum and maximum of the values of the equation of time:

The shape of the equation of time varies across millennia:

Take a location in the Northern Hemisphere and a given date:

The Sun reaches its highest altitude at upper culmination, crossing the meridian at that location:

Upper culmination defines the instant of solar noon, corresponding to 12 hours of solar time:

The Sun at this moment has azimuth 180 degrees, as observed from that location:

Solar noon and civil noon can be far apart:

Take all civil noons during a year, ignoring daylight saving changes:

Compute the corresponding solar noons for your location:

Find the durations of all solar days during a year:

The duration varies during the year, with longer days in June and December and shorter days in March and September: