Implementing the routines in Practical Astronomy on Your Calculator, by Peter Duffett-Smith.
- Practical Astronomy on Your Calculator (Third Edition)
- Practical Astronomy on Your Calculator or Spreadsheet (Fourth Editiion)
In most cases, I implement everything exactly as they are presented in the book and use the same variable names and steps. There's very little programming trickery or cleverness.
Input data are in data/. They look like CSV files, but I include a few lines at the top to note their source. Files are tagged with 1990 (Third Edition) or 2010 (Fourth Edition).