Egyptian astronomers noted eclipses and Moon phases.
Egyptian and Sumerian astronomers identified constellations and star motions.
Babylonian astronomers recorded Moon and Venus cycles.
He described Sun and Moon motions.
Egyptian astronomers measured years by the star Sothis (Sirius).
Aristotle wrote that Earth is spherical and people had known it for long time.
He lived -310 to -250, invented heliocentric theory [-260], calculated Earth-to-Sun distance to Earth-to-Moon distance ratio from angle at half moon, found Moon distance and size from Earth shadow on Moon during lunar eclipse, and stated causes of night and day and seasons.
He lived -190 to -120 and measured relative star brightness, equinox precession [-150], and Moon size from lunar-eclipse parallax [-130].
Mayan astronomers gathered to correct their two calendars.
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Date Modified: 2022.0225