A ay (symbol: d) is a unit of time equivalent to 24 hours. It is not an SI unit but it is accepted for use with SI. The term comes from the Old English dæg. The word is also used to mean daytime, the period of daylight experienced once per day and alternating with night.

Trivia about day

  • The length of this on Jupiter is less than 10 hours
  • According to a proverb, "Every dog has his" this
  • Gray:"The curfew tolls the knell of parting" this
  • One of these on Venus lasts about 244 Earth ones
  • Die Another ____Tripper
  • The words journey, journal & diurnal are all based on this unit of time

Found pages about day