Medieval MS numbers/alphabet?

[Botis]

Came upon this thing, wasn't quite sure where the best place to post it would be... 

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This page and the one before have some examples of medieval numbers and of writing from different language. I'm not sure what is going on upon the particular page I'm showing (astronomical abbreviations?)

[david]

It's an astronomical calendar showing a correlation between the litergical calendar and the signs of the zodiac.The letters are a system which called epacta which is a series of 30 letters showing the phases of the moon counting from the start of the year. (I think, can't really see clearly on my phone screen but they seem to be repeating in a thirty sequence although a load are missing from the bottom of the page for many columns).

It's basically a lookup table for moon phase / zodiac correlation over the course of time.