Don't expect extreme astronomical accuracy with this watch.  I teach astronomy and the watch is more for show than actually using on a starry night.  Very nice looking watch at a very affordable price.  Love the non-leather band as well.  Glow in the dark feature is cool and doesn't require the use of a button.  Only complaint is that it is hard to tell time!  Hands are not distinct enough I guess so the constellations are more visible.  Sliding cover obscures hands at times.  Recommended for lovers of astronomy themed fashion and single men - this watch is definitely a conversation starter!  Birthday present to myself - I love it!