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How long is a day?

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If the plane of the earth's orbit about the sun coincided with the plane of the equator, day and night would each be 12 hr long everywhere on the earth all year long. However, because of the tilt of the earth's axis of rotation, the times of sunrise and sunset vary from day to day, with the result that in the Northern Hemisphere there are long days and short nights in the summer and short days and long nights in the winter.

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Get more facts and information about day . Or, view the full encyclopedia entry from The Columbia Encyclopedia, Sixth Edition.

Similar questions: Why does the length of the day change? When does the sun rise? When does the sun set? How does the length of the day vary? [ Hide these questions ]

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