Leap Day 2012 Mystery Cache

This cache has been archived.

dgauss: Hate to eliminate a leap day puzzle but a tornado and the subsequent cleanup makes that the prudent action.

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Hidden : 2/29/2012
Difficulty:
2 out of 5
Terrain:
2.5 out of 5

Size: Size: micro (micro)

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Geocache Description:

The cache is not located at the posted coordinates. Rather it is at:

N 44° 23.CDF W 93° 11.BEA

Due to the definition of leap year, our calendar is on a 400-year cycle. Coincidentally, a simple calculation will tell you that there are exactly 20,871 weeks in a period of 400 years. Thus the day of the week is also on a 400-year cycle; that is, the day of the week will be the same for any two dates 400 years apart.


  • During any 400-year period, how many leap years are there? AB
  • In how many of these is leap day on Wednesday? CD
  • Leap day, 2/29/2012, is on a Wednesday. How many years will it be until another leap day is on a Wednesday? EF

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