The slideshow presentation on the Nature of Science.ppt

1) Ancient Greek scientists Eratosthenes and Aristarchus used early scientific methods to make accurate estimates of the size of Earth and distances to the moon and sun. 2) Eratosthenes calculated Earth's circumference in the 3rd century BC by comparing shadows at different locations, arriving at a measurement within 10% of the actual circumference. 3) Aristarchus estimated the sizes of the moon and sun and distances to them in the 3rd century BC using geometry during lunar eclipses, coming within 5% of their actual sizes and distances.