There usually isn't. The amount of sunlight varies from place to place and season to season. The average is half and half. It is hard to explain, but the whole concept of time is a man made concept. He looks at nature and related it to what he saw. The Earth goes through a cycle of time, a revolution around the axis is a day.
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No place on Earth has 12 hours of daylight each and every day. Or, for that matter, on the Moon either, or on any known body in the Solar System..
March 20 and September 23 are the two equinox days when there are 12 hours of daylight and 12 hours of darkness at any place on the Earth.
That depends on the season. On average, it should be about 12 hours.
it varies
Because God is sometimes happy therefore there is 24 hours of daylight and then sometimes God is sad or angry and therfore there is 24 hours of night.