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There are 12 times 10 = 120 years
Ten of them because 10 times 100 years = 1000 years
4497 times.4497 times.4497 times.4497 times.
60*60*24*365*77.9 = answer That is, 60seconds in a minute, times 60 minutes in an hour times 24 hours times 365 days in a year times 77.9 years (leap years not taken into account).
It happens 56 times out of every 400 years.