When is Easter?

Type the year that you wish to find when Easter is/was into the box on the right and press calculate:

Note: This calculator is only accurate for Gregorian dates (years after 1582) and it will eventually become inaccurate (after a few hundreds of thousands of years!), since the planets rotation is slowly decreasing.


When the day that Easter falls on is plotted on a graph, we see that Easter is a Quasicrystal.

For more information on this topic, see Scientific American, March 2001.



Jamie Coventry
22nd March 2001