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In Treasure Of Khan by Clive Cussler, the main protagonist is lost in a desert and uses his watch to determine directions, here is the quote :

An old survival trick, he knew that south must be halfway between the hour hand and twelve o'clock if he was standing in the Northern Hemisphere.

I didn't quite understood it. Is this a real trick ? Is there a name for it ? How does it work ?

marked as duplicate by Charlie Brumbaugh, Community Dec 4 '17 at 16:36

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