Missouri State University's


Barth's SixthDegree Surface rendered by Tore Nordstrand 
Recall that in the Gregorian calendar there are leap years in years that are divisible by 4 but not 100 and in years divisible by 400. There are 14 possible calendars, 7 for nonleap years (depending on what day January 1 is) and 7 for leap years.
Source: Ivy Fitzgerald
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This page is maintained by Les Reid. Last updated January 8, 2015.