Revolution of Earth
المؤلف:
Diane Fisher Miller
المصدر:
Basics of Radio Astronomy
الجزء والصفحة:
p64
3-3-2016
2117
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.
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