Astronomical / Astrological resources for 13th century

players of my troupe please stop reading.

.

.

.

.

.

.

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.

1 Like
2 Likes

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

3 Likes

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

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.

6 Likes