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The astronomer Sosigenes calculated that the length of a year was 365 1/4 days. He also brought about the leap year rule, where a leap year would occur every fourth year.

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10y ago
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7y ago

365 and a quarter days.
365 1/4 days

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Q: What did astronomer sosigenes calculate the length of a year to be?
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Related questions

What did the astronomer sosigenes use to calculate a year?

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Which Indian astronomer first calculated accurately the time taken by earth to orbit sun?

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