Who determined that Earth is round because it cast a shadow on the moon during a lunar eclipse?

The first person to actually calculate the circumference of the Earth was

The ancient Greek model of the universe in which the Earth and other planets orbit the sun is best described as the

The Greek model of the universe in which the moon, sun and known planets (Mercury, Venus, Mars and Jupiter) orbit Earth is the

Over a period of time, viewing Mars from Earth, Mars appears to move eastward among the stars. Then, periodically it appears to stop and reverse direction. This apparent motion is called

Which model had the planets moving in circular orbits around a motionless Earth?

Nicholas Copernicus proposed a model of the solar system with

One of the three laws of planetary motion that Johannes Kepler discovered is best described as

Who discovered (1)4 moons orbiting Jupiter (2)Venus has phases like our moon (3)sun has sunspots

Who formulated and tested the law of universal gravitation which states (1)gravitational force decreases with distance (2)greater the mass of an object, greater its gravitational force

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