I have been puzzling and puzzling till my puzzler is sore over why Easter is April 20 this year, and not April 13. Easter is conventionally said to occur on the first Sunday after the first full moon that happens on or after March 21--right? So two different calendars I've seen show the first full moon after March 21 as occurring Saturday, April 12. So why isn't Easter the next day, Sunday, April 13?
I guess this is the answer.
"The full moon in April 2025, also known as the 'Pink Moon,' will occur on Sunday, April 13th, at 00:22 GMT (April 12, 8:22 p.m. EDT)."
This was an AI generated response when I googled the question "When is the full moon in April 2025?"
So the date of Easter is calculated by when the full moon occurs at the Prime Meridian? I guess this explains it? Full moon is (I presume) 22 minutes after midnight at the Prime Meridian, which makes it actually April 13, therefore Easter is the following Sunday, April 20. I guess this also explains why the calendars I've consulted show the full moon as occurring Saturday night, April 12--those calendars are based on some longitude in the U.S.
I've never heard of the Pink Moon.