quarantine 'em

Neither the ecclesiastical full Moon nor the ecclesiastical Northern Hemisphere spring equinox are derived from astronomical observations...

If they were derived from astronomical observations, this would all be a lot easier!

The ecclesiastical Northern Hemisphere spring equinox is 21 March by definition. Okay, that part is actually easier...

Meanwhile, the ecclesiastical full Moon is the 14th day of the lunar month. The lunar month, you say? In the lunar calendar?

If only there was an easy way to convert the Gregorian calendar to this lunar calendar. But as far as I can tell, nobody does this!

In fact, the actual lunar calendar itself seems to be completely missing from the literature. It's really bizarre.

It could be that all the stuff I'm referring to exists in history books, not so much online. I am not a good historian.

It could also be that the Gregorian <-> lunar conversion *is* harder when all you have is a pencil and paper. I forget about that sometimes