On Earth, daytime is roughly the period on any given point of the planet's surface during which it experiences natural illumination from indirect or (especially) direct sunlight.

Other planets that rotate in relation to a luminous primary, such as a local star, also experience daytime of a sort, but this article primarily discusses daytime on Earth.

https://en.wikipedia.org/wiki/Daytime

"Better by far to embrace the hard truth than a reassuring fable."
Carl Sagan
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