And throw on a compass to align it correctly. Of course this has been done already, and you can be the proud owner of a wrist sundial for only $40! https://www.

And throw on a compass to align it correctly. Of course this has been done already, and you can be the proud owner of a wrist sundial for only $40! https://www.amazon.com/Sundial-Compass-Leather-Strap-C-3117/dp/B00L7VAL0U https://www.amazon.com/Sundial-Compass-Leather-Strap-C-3117/... Infinite battery life! Eat that, user5994461's watch! ;)