because it just does. end of conversation
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Anywhere on or close to the equator.
At the north and south poles . . . all the time Everywhere else . . . on the occasion of the equinoxes, March 21 and September 21.
It doesn't have a velocity! However, in theory, one could say that darkness is the only thing that replaces light!! So as light goes away, darkness takes its place!! So darkness probably travels at the speed of light :D - 186000 miles per second (that's about 7.5 times round the earth in a second)
Light-hours?
If you're in the dark, seek for light; If you're in the light, seek for brighter light; never seek for darkness, coz if you do, it's what you'll gonna get.