Clocks, watches, sundials, kitchen timers, hourglasses, etc. Or any other indication of what time it is.
For pictures taken by moonlight, or of the moon, but in any case with no artificial light.
Pictures of a blurry white dot in a black sky will be deleted due to extreme lameness.
Pi Day takes place every year on 3/14. This account is for anyone to post pictures of pi on or around Pi Day.