### Re: why do we have different days each month?

Area: Astronomy
Date: Fri Jan 10 17:17:18 1997
Message:

The number of days in the months has originated through a long and tortuous history of the calendar. Here are some hyperlinks I have found using the search engines Yahoo, Lycos, and Alta Vista:

Origins of the Gregorian Calendar http://en.wikipedia.org/wiki/Gregorian_calendar

A Partial Explanation of the Days Assigned to Months http://ecuvax.cis.ecu.edu./~pymccart/poor-richards.html

What is interesting is that, although the length of the year has been pretty well defined, the assignment of the lengths of the months seems to be a bit murky. Indeed, if I were assigning days to the months I would probably do something like the following:

Jan: 31 Jul: 30
Feb: 30 Aug: 30
Mar: 31 Sep: 31
Apr: 30 Oct: 30
May: 31 Nov: 31
Jun: 30 Dec: 30

for a total of 365 days in the year. I would use the leap year formula to add a day to the month of July in leap years.

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