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I don't know what watch you have seen, but here is an explanation of a similar watch: http://newatlas.com/krayon-everywhere-watch-sunrise-sunset/5...

TL;DR: The factors such as latitude are user-programmable.

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This clock is really impressive, but it took me nearly 10 minutes to find out what time it is on the pictures. The graphical display of sunrise and sunset on the other hand is genius.

Thanks, haven't seen this one. There is no explanation per se, but this confirms that it's doable. Knowing the answer exists is half of the solution :)

PS. And it's only 6.5 mm thick!

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