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To be fair, your watch can be replaced by a well crafted stick and dial combo.

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/...

Infinite battery life! Eat that, user5994461's watch! ;)

Coincidentally, my watch has a compass :D

There is no place on Earth that gets sunlight 24/7 all year round.