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Replying to @cmenscher
Just watched it! Believe it or not the watch already has to deal with leap seconds; turned out to be crucial for planet tracking. (I used someone else’s public domain code for this; seemed like the kind of thing I was unlikely to get right 😬) https://github.com/joeycastillo/Sensor-Watch/blob/1aac7bf535a9170aaf4aea820dcd81746eb3647e/movement/lib/vsop87/astrolib.c#L91
(original)