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The length of the day and night varies according to the season and latitude.

The combined day/night cycle is 24 hours on all places on Earth.

If you live inside the Arctic or Antarctic Circles you have 24 hour cycles of daylight sometimes and 24 hour cycles of night sometimes.

Only at the equinox are the day and night equal.

Note: there are some quibbles about the length of the day because it depends on whether you define the day as starting when the sun just starts to peek out and ending when it just has its last visible piece. If you instead define it as when the middle of the sun becomes visible until when the middle of the sun is below the horizon, that makes a few minutes difference.

One can write a mathematical formula for this that is correct to within a few seconds for any latitude and day of the year.

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12y ago

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