Astronomical / Astrological resources for 13th century

Games Discussion Ars Magica
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players of my troupe please stop reading.

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Does anybody have Astrological/astronomical resources available for 13th century?
I just discovered that the site I was using to calculate Full Moons for the Lycanthrope companion was giving me Moon phases for 2020 rather than 1220 that I thought I asked.

Also, bigger ask, looking for a computable (Artes Liberales roll) event that happens once or twice a year. Lasts long enough for a few hours hopefully mystically associated.

Unless there is something better, I had been thinking of the first full moon on or after the equinox
eg "When the world is in balance, the moonlit gate to Ironwood doth open"

But I don't have Moon phases at the moment.

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IMG_2112
IMG_21121186×1458 376 KB

Found by a player in my saga with Major Magical Focus: the Moon.

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Julian or Gregorian dates?
Strictly doesn't matter, as in my saga all dates are assumed to be effectively equally Julian and Gregorian.

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Astrodienst.com has tables for astrology going back further than that, also their horoscope chart creation system can be used for Ars Magica date ranges there may be a moon phase thing but what I have used it for are more the astrological bits including making a birth horoscope for one of my magi born in the late 900s. If you know which calendar it will do the corrections for you.

EDIT: You're going to want to scroll down and click the link for the 9000 years of Ephemeris.

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