The Stonehenge Pocket Watch
The Stonehenge Pocket Watch is kinda cool…
Using the easy to follow, illustrated instructions, you can use the stones (which have the same layout as the actual Stonehenge) to tell local time by orienting your watch with the accompanying high viscosity compass.
The Stonehenge Watch can also be used to predict the exact moment of the winter and summer solstices
It includes a precision analog watch that is set into the reverse side of the watchcase.