We created a Date of Easter Astronomy Calculator.
I have created the first Astronomy Calculator which is the Date of Easter. The calculations are based on the book Practical Astronomy with you Calculator or Spreadsheet by Peter Duffett-Smith and Jonathan Zwart.
The method the authors showed in their book is based on a method devised in 1876 which was in Butcher’s Ecclesiastical Calendar. The astronomical calculation is valid for all dates from 1583.