Q:

Why are there 365 days in a year instead of 364?

A:

Quick Answer

One year is measured by the time it takes a planet to orbit the sun, and 365 days is the best estimate for how long it takes Earth to complete a full trip around the sun. Years on other planets are measured in comparison with the Earth year, and one year on most planets is longer than one year on Earth.

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Full Answer

According to Northwestern University, it takes Earth 365.25 days (365 days and 6 hours) to orbit the sun. The trip is a total of 584 million miles. The sun itself has a small orbit of 223.7 million miles that only takes three Earth-months to complete.

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