For the truly obsessive-compulsive who panic if their watch is even slightly off, the Seiko Astron GPS watch could be the answer. The world’s first solar-powered watch that can set the time with GPS signals, the Astron is accurate to within one second per 100,000 years and automatically adjusts to any timezone in the world. Seiko announced the release of the Astron back in March and it’s now going on sale worldwide.