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by Anonymous on September 28th, 2006

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Why are days longer than nights at certain time of the year?

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  • by Glenn Blaylock on September 28th, 2006

    Glenn Blaylock

    Earth rotates about its axis. This is the imaginary line that connects the North and South poles. This rotation is what causes the day-night cycle. However, Earth's axis is not perpendicular to the plane of its orbit. It is actually tilted 23.5° off of perpendicular. Because of this, as Earth orbits the Sun, its orientation on the Sun changes. During the summer, the portion of the Earth that is experiencing summer is tilted toward the Sun. So, it gets longer days. During the winter, the portion of the Earth that is experiencing winter is tilted toward the Sun. So, it gets shorter days. Just how much variation you get in the length of a day from summer to winter will depend on one's latitude.

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    • If you are at one of the poles (north pole or south pole), then you get only one sunrise and one sunset in a year.

      Anonymous

      by Anonymous on September 28th, 2006

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