46 BC
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Sidereal year
Sidereal time
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Kidinnu
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Ulugh Beg
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Year
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Zodiac
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Venus
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Second
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Mercury (planet)
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Mass
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Leap second
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Lunisolar calendar
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Hipparchus
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Hinduism
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Earth
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Solar calendar
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Analemma
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Axial precession
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Eclipse cycle
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