# How much of one day can be considered nighttime, on average?

What is the split between night and day on Earth on average?

To further clarify, assume we are on the equator, I want to know how long a time, as a percentage, you could consider to be nighttime on Earth, with the points in time separating night and day being within sunrise and sunset.

I tried to answer for myself with many a time spent on Google, but I came up lacking so I am here to ask for help from you intelligent people that roam these parts of the internet.

I hope this question fits in Earth Science, I couldn't think of a better place to ask.

• the average night is very close to 12hours,the average night in antactica is12hours 6 months night and 6 months day,the closer one gets to equator the less variation it is to the duration of day/night. home work questions is of topic here and this have to be home work. – trond hansen Jan 5 '18 at 6:39
• @trondhansen this might not be homework. The average global percentage between night and day must be 50% if sunset/rise is defined as the 0 degree angle. – Communisty Jan 5 '18 at 8:07
• @Communisty i did not make this as an answer as i am a little unsure if there is some difference in the duration of day or night as a result of the earths orbit and the lunisolar precession. – trond hansen Jan 5 '18 at 9:10
• I would say all effects of precession to the length of the day will average to zero in time. – Communisty Jan 5 '18 at 11:19
• trond hansen Communisty was right, it's not homework. It was a spur of the moment question that I decided to research by my own interest. I was thinking of arc seconds because in one article I read there being approximately 50 arc seconds of sunlight before all sunlight is gone during sunset. David Hammen answered it well already. Thanks anyways :) – Sam Chamberlain Jan 5 '18 at 15:58