How bright would the Earth be at night without the moon? Specifically, how much light would reach the surface of the Earth at sea level?

  • 4
    $\begingroup$ Sorry, I don't really understand how the question differs from the usual monthly new moon phase? $\endgroup$
    – zeldredge
    May 25, 2015 at 20:44
  • 1
    $\begingroup$ Depends on whether the sky is cloudy or not. Under a cloudy sky it's pretty dark. $\endgroup$
    – CuriousOne
    May 25, 2015 at 20:53
  • $\begingroup$ @CuriousOne well, your comment certainly brightened my day $\endgroup$
    – user81619
    May 25, 2015 at 20:56
  • $\begingroup$ @AcidJazz: I am glad to have brought light to this shady matter. $\endgroup$
    – CuriousOne
    May 25, 2015 at 20:58

1 Answer 1


Every month there is a new moon. The moon isn't visible on this day. You've seen it before. That's how dark it would be.

  • $\begingroup$ That's a good point, although we still get light from the sun, even during a new moon. $\endgroup$ May 25, 2015 at 21:22
  • $\begingroup$ So go outside on an overcast new moon night, and see. :-) $\endgroup$
    – KlaymenDK
    Oct 23, 2016 at 15:00

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