Recent content by Don Wong

I have read that wiki before, but i think this question doesn't require the knowledge of the lunar phase system. It is just the calculation of the gear ratio as it states in the website.

I would like to calculate the gear ratio of this moonphase watch, however i cannot calculate the exact day of its mentioned. What's wrong with my calculation? https://www.ochsundjunior.swiss/watches/moon-phase/tech-specs/ my calculation is 1/(2/12*14/18*14/109)/2=30.03 which is different from...