A hand-powered clock from 2,000 years ago revealed a big secret with new astronomy research. The Antikythera mechanism's calendar ring likely followed the lunar year.

This contradicts a century-long assumption among scholars of the mechanism that the calendar ring had 365 holes, thus tracking with a solar calendar, but is in keeping with the conclusions of a ...

Perpetual Ring Calendar. 2:16 pm May 22, 2018 By Julian Horsey. Athlone Designs has created a unique perpetual calendar constructed from aluminium and titanium and featuring a patent-pending design.

My old SE t610 had a calendar app that allowed you to set the ring profile that the phone would switch to, automatically, during a given appointment on the ...

A hand-powered calculator from 2,000 years ago, known as the Antikythera mechanism, had a calendar ring that likely followed the lunar year.