![]() In the 4th century B.C., Aristotle of Stagira knew the Earth was round because of eclipses observed when Earth passed between the Moon and the Sun.noticed that the so-called evening star and morning star were the same body, the planet Venus. The Greek philosopher Pythagoras about 550 B.C. ![]() Early Greek astronomers learned from the Babylonians.The Egyptians referred to those stars as "the indestructibles." Today we know them as Kochab, in the bowl of the Little Dipper (Ursa Minor), and Mizar, in the middle of the handle of the Big Dipper (Ursa Major). In particular, they were drawn to two bright stars that always could be seen circling the North Pole. Ancient Egyptians were very interested in the night sky.In fact, the oldest records we have of astronomical observations are 30,000-year-old paintings found on the walls of caves. Early people noticed constellations of stars in the sky that looked like animals and people, and made up stories about what they thought they saw.Early on, they noticed that the Moon changed shape from night to night as well as its position among the stars. For tens of thousands of years, human beings have been fascinated by the patterns of stars in the sky above Earth.
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