How many days does it take Earth to complete one orbit of the sun?

Microsoft Rewards Bing Earth Quiz: How many days does it take Earth to complete one orbit of the sun?

A 365.25
B 365
C πr2

Based on three different models of measuring our solar year, one trip around the sun takes about 365 days…and an extra quarter of a day. That’s why every four years, with a few exceptions, we add an extra day to the calendar and enjoy February 29—Leap Day.

The correct answer is 365.25.

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