In this post, we take a look at an ancient gadget that helped us read the time when mechanical clocks hadn't been invented yet. Since I'm planning to make one such sundial myself, it seemed just the right time to write this post and find out how this sundial works and how to make it properly. In an earlier post "Atomic wall clock" we could read, that in the heart of every clock we can find a device that oscillates at a certain frequency. This device, which oscillates at a certain frequency…
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Generoso Parrenas