Moon Chart — Reference — $2.99
If you’re looking for a quick, easy-to-use reference guide for that giant rock in the sky, Moon Chart is a pretty good one. It’ll show you the phase and point out what scientists have named all those holes and fiddly bits, and it’s all indexed. So if you have a bet with your buddy as to where Flammarion is in relation to Sinus Medii, this app will help you settle that weird, random thing I just made up.