This elegant timepiece may not offer as much practical 'geek' as we have come to expect from the latest feature-laden Casios. However, the Equinox Watch, conceived by the Portuguese designer Nuno Teixeira, will certainly keep you on time... in a celestial sort of way.

The watch functions by representing the exact time when the sun is positioned directly over the equator, says Tuvie. The two opposite dials were designed to display the Sun, representing the hours, and the Earth showing minutes.

The Equinox Watch appears to be a pure concept. Its movement also remains somewhat of a mystery. Is it quartz or is it more like those sliding paper calendars from the fifties? Does it use batteries, and if so, what kind? One thing is clear: it has buttons and looks mighty cool!

Want to drool over some more ingenious timepieces? Check out PC Mag's recent review of the 10 Geeky Digital Watches.