The Lunar Clock: Timekeeping on the Moon

Space organizations around the world have agreed to implement a proper lunar time zone, an internationally accepted common lunar reference time that all future missions can use to communicate and navigate with ease. Dr. Kenneth L. Franklin, a well-known American astronomer, developed a special formula for telling time on the moon in 1970, and using his calculations, a then well-known watch company, Helbros, actually developed a wristwatch that could provide at a glance the precise time on the moon. The watch was based on the lunar synodic month or lunation, and the face of the watch actually gave the time in lunours, centilunours, and millilunours.