what, no astrolabe? astrolabes are the direct precursor to mechanical clocks, you can think of them as a slide rules with a inclinometer and a star map, and the

what, no astrolabe? astrolabes are the direct precursor to mechanical clocks, you can think of them as a slide rules with a inclinometer and a star map, and their primary application was to convert the altitude of visible stars or the sun into the current time