Just came across another lovely example of SciFi history in The Test Colony by W. Marks (1954): My 20-hour wristwatch, geared to the shorter rotations of Sirius XXII, said nine o'clock.
I usually wear mechanical watches but at the time I was wearing a Suunto X-Lander which has all sorts of computer readouts including altimeter and compass. Again one of those neat situations where reality has overtaken the science fiction and made it look quaint.
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