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12 signs 24 hours 24-hour dial 60 teeth 72 teeth Alfonsine tables annual calendar dial annual calendar wheel annual wheel arbor argument arm marked Verus astrolabe astrology Baillie band blunt-toothed wheel Chioggia circumference common pinion complete revolution correct cycle deferent and equating Dial of Saturn dial of Venus diameter divided dominical letter Dondi gives drive Easter eccentric elliptical wheels engagement epicyclic dial equal angles equal periods equating circle equating wheel Eton College firmament frame framework horological hour dial Jupiter leap year day lunar dial Mars mean motus mechanical clocks Mercury moon moon's movable feasts movable wheel moving Nodes opposite Padua pinion of 12 planetary dials planets point of Aries Primum Mobile radius residual error revolves sidereal day slot spheres stopping the clock studs sun's deferent sunset temporal hours tooth turning the wheel wheel of 20 wheel turns wheel with blunt zodiacal circle