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Jens Olsens Clock Introduction
The Strasbourg Clock and Jens Olsens Clock
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29 days adjustment arranged astronomical astronomical clock bearings bevel wheel carries centre wheel cord pulley crank date wheel detent diameter Pitch radius differential wheel dominical letter drum wheel epact equation escape wheel evection fitted fixed front work plate Full diameter Pitch gear gearwheels golden number Gregorian calendar impulse arm Jens Olsen Jens Olsen's clock Julian period jumps lamellae last wheel leap day lifted line-of-apsides line-of-nodes lunar cycle main calendar mean day mechanism mesh minute wheel moon hand movement node number drums number of teeth number ring Otto Mortensen passing pendulum pillar screw pinion Pitch radius Arbor placed planet position radius Arbor distance ratchet wheel rear work plate release revolution rocker arm roller wheel sidereal day solar cycle spacer pillars steel arbor steel pin steel ribbon steel ring sun and moon sun hand synchronoscope toothed sector train of wheels transmitted triple-dial true solar tube uneven motion weight