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How did early man measure time?

The moon was man's first calendar. The moon waxes and wanes; from being almost invisible, it grows to a full, round globe, and then gradually disappears again. Men found that it took about 12 moons, or 360 days, for the seasons to complete one cycle.

This was the first measure of length of the year. The connection between the regularity of the seasons and the position of the sun and stars was the next observation used to measure the passage of time. By locating the position of a certain star on the eastern horizon just as the sun was setting, it was possible to measure the length of the year more accurately. As early as 4000 B.C., the ancient Egyptians had already set the year at 365 days.

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