I have updated AstroExcel to now include a function for right ascension and declination (usually abbreviated to RA & DEC). The altitude and azimuth of an object are dependent on time and your position on the Earth, because of this astronomers usually use RA and Dec which is a coordinate system that doesn’t* rely on […]Read more "Calculating Right Ascension & Declination"
I recently added a function called MoonRise() this function can return the rise, set or transit across the meridian by the Moon. I had a quick look in the various books I own for an algorithm to directly calculate Moon rise but this turned up nothing and a search on-line also drew a blank. So I had […]Read more "Calculating Moon Rise and Set"