Hi, sorry to revive such an old topic, but since I've added to the calendars I thought it'd be cleaner to just post to the original thread instead of creating a new one.
I have extended the calendars I originally made so they cover all the years from 1220 through to 1300.
I have also changed the way I calculate the date for Easter Sunday on the calendars. I was previously placing it in the first Sunday after the first full moon that happens
on or after the spring equinox. Which is the official calculation supposedly used after the Nicean Council of AD325. But the Church actually used March 21 (the Ecclasiastical Equinox) as the date for the spring equinox, instead of the actual date of the equinox, which would have been a reasonable approximation where it not for the fact that the Julian calendar they were using back then was already off by about a week from the actual solar year.
More so, the date of the full moon they were using was a date pulled from some pre-calculated tables (the Paschal Full Moon) instead of the actual date of the full moon. The Paschal Full Moon is calculated nowadays through complex formulae that place it quite close to the actual full moon. But in the 13th Century it was calculated from tables representing the 19 year Metonic Cycle.
So I've re-calculated all the Easter Sundays in the calendars to use a Paschal Full Moon calculated from Metonic Cycle tables, which is astronomically wrong but is what people in the day would be using. So Easter Sundays are now probably more accurate to the date they were actually celebrated in the 13th Century, and thus closer to the actual date on which the it would happen for the characters.
As always, bear in mind the calendar is a Julian calendar (the one used by people at the time), and so by the 13th Century it's already off by a week or so from the actual solar year. Meaning equinoxes and solstices will appear to be off by around a week, but what is actually off is the calendar. Those are as close as I've managed to the actual dates they happened in the calendar used at the time.
I've separated the calendars into three ZIP files. Two of them are in english, one in Letter page size and the other in A4 page size, so they can be used by english-speakers from the US or elsewhere. The third one is in spanish in A4 page size; since I had already made it for my own use I thought I might as well share it. Each ZIP file has two PDF, one in full color and another one in black and white to be printer-friendly.
Without further ado, here are the calendars:
Calendars 1220-1300 - English, Letter (4.63Mb ZIP file)
Calendars 1220-1300 - English, A4 (4.53Mb ZIP file)
Calendars 1220-1300 - Spanish, A4 (4.54Mb ZIP file)
I have edited the original post to point to the current files as well as to reflect the changes in content in them.