Hipparchus was best known for his

Which of the following was unknow to the ancient Greeks

Aristotle concluded that Earth was round because

The apparent westward movement of a planet against the backgroind of stars is called

According to the ancients, the stars travelled around Earth on the transparent, hollow

In the Ptolmaic model of the universe

One Astronomical unit averages about

A measure of the total maount of matter an objecg contains is called

The force gravity exerts on an object is called

Which scientist determined the nature of the forces that keep the planets in their orbits

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