The Planisphere watch has a mini Planisphere on the dial, displaying the constellations visible in the Northern Hemisphere. Simply align the date and time (displayed on the edge of the bezel) and you can view the major constellations visible that evening. The watch can also be used as a compass.

The rubber band watch features a scratch resistant crystal dome lens in a brass case, Japanese quartz movement and a "Super Luminescent" dial that glows for 2 to 3 hours straight.

So if you are an astronomer or want to be one, this could be a geeky gift to yourself or someone who wants to be one. Grab it from Think Geek for US $49.99