AstroPhysics3 - parts. Summer hours longer than winter...

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Orientation of Crescent Moon with respect to horizon was used to predict rainy season in central Nigeria • Oldest Astronomical Record: Ishango (animal bone) depicting lunar calendar from about 6500 BC • Egyptians (2000 BC) divided daylight into 12 equal
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Unformatted text preview: parts. Summer hours longer than winter hours. By about 1500 BC Egyptians used water clocks. Hour glasses using sand were invented in 8th century AD....
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