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.
Tagged: Date of Easter
After more searching on Amazon, I found Practical Astronomy with your Calculator or Spreadsheet by Peter Duffett-Smith and Jonathan Zwart. This will be my guide on my journey to create the Astronomy Calculator. The fourth edition was published in 2011 so it is current. It also had a website where you can download the Excel spreadsheet with will greatly help in understanding the formulas and testing my website.
So, I now have all the books I need and finally time to start learning about the formulas and translating them into web programming. This journey begins….
In my searching for books on Amazon, I found a book called Astronomical Algorithms by Jean Meeus. It was claimed to be the first book that made astronomical calculations available to the casual astronomers. It was focused on “calculators” but since the first edition was written in 1979, an iPhone today would seem like a mainframe computer. I had to get this book. I also got his original Astronomical Formulae for Calculators.
This books will be the basis for the Astronomy Calculator so I am in his debt.