Open the ESAA PDF alongside a (Python with skyfield or astropy ) or a spreadsheet. Use the book’s equations to replicate one small table (e.g., Equation of Time). That hands-on step is the fastest way to learn.
The Explanatory Supplement is essential for anyone who uses the Astronomical Almanac or works with astronomical data. By providing detailed explanations and background information, the Supplement: the explanatory supplement to the astronomical almanac pdf