How many hours of darkness is there in a year?

Answer 1

There are 8760 hours in a standard year and 8784 in a leap year. At any time is dark somewhere on Earth, so you could say there are 8760 hours of darkness in a year and 8784 of darkness in a leap year. Another way of looking at it is where you are on the planet. At different times of year there are different amounts of darkness and daylight and then there is twilight. You could say it is dark anywhere for about half the year, so that would be 4380 hours in a normal year and 4392 hours in a leap year.