Why is Easter so early this year?

Easter falls on the first Sunday after the first full moon after the spring equinox. The equinox is march 20th and the first full moon after that is march 21st, which is a Friday. Easter falls on Sunday the 23rd. The latest Easter could be is if the moon is full one day before the equinox and the equinox happens to be monday. The next full moon would be about 27 days after the equinox. Easter then fall in or around the 24th.