Aristotle brought out a philosophical description of the universe. In it, the Moon was described as a border element, a boundary between the Earth and other imperishable stars. This philosophical view dominated the thoughts about the Moon for centuries.
Some important studies about the Moon and its movement came out in the second century BC. Seleucus of Seleucia studied and theorized tides and tidal movements. He found out that tides were formed due to the attraction of the Moon, and that their height depended on the Moon’s position relative to the Sun.
Aristarchus is credited with another important finding. He computed the size and distance of the Moon from the Earth. According to his findings, the distance from the Earth to the Moon is almost twenty times the radius of the Earth. Ptolemy studied and improved these values further.
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