This is an accurate moon phase. The moon indicator has been accurate for three months. It may need periodic adjusting, although I don't think it should as the moon is reliably consistent and the watch should be accurate over long periods. The watch is plain, which is not a bad thing. I have some flashy watches which look good but sometimes they seem too flashy, so I like plain and elegant more. This watch is plain and elegant. For example, plain white face, no hour numbers just markers. The date window is exceedingly small. This is about the most inexpensive, high quality moonphase you can buy and that's why I bought it. I like the moonphase (even though one does not need it for any practical reason), and if I ever bought another moon phase watch, I'd probably go with another watch that is a little more exquisite.