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Technically I should be posting about this next week, but eh, close enough

This is the Konstantin Chaykin Moscow Comptus Easter Clock

This thing has 26 different indications on it, including the date of orthodox easter, starmap, analemma, and length of day

https://monochrome-watches.com/konstantin-chaykin-moscow-comptus-easter-clock-most-complicated-clock-ever-made-in-russia/

It's incredible