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Revolution of Earth

المؤلف:  Diane Fisher Miller

المصدر:  Basics of Radio Astronomy

الجزء والصفحة:  p64

3-3-2016

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 Revolution of Earth

Earth revolves around the sun in 365 days, 6 hours, 9 minutes with reference to the stars. Its mean orbital speed is about 100,000 km per hour. The 6 hours, 9 minutes adds up to about an extra day every fourth year, which is designated a leap year, with the extra day added as February 29th.