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.

While many ring in the Year of the Rabbit, Vietnam celebrates the cat. January 21, 2023 7:01 AM ET. ... also called Tet Nguyen Dan, is determined using the Chinese lunisolar calendar.

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