Universal running equation of time mechanism and method of setting the same

An universal running equation of time mechanism comprising:

• a differential device, wherein a first input of the differential device is formed by a cannon-pinion for the minutes of civil time, and wherein a second input of the differential device is formed by a running equation cam, wherein the differential device outputs on a pipe a running equation minute which indicates the difference, for a given day, between civil time and solar time, wherein the running equation minute pipe drives a true running equation minute pipe which, via a true equation motion work, drives a true running equation hour, wherein the cannon-pinion for the civil time minutes drives, via a motion work wheel set, a civil time hour wheel, wherein a jumper spring, integral with the true running equation hour wheel, cooperates with a star wheel having twelve teeth connected to an arbour carrying a true running equation hour hand, wherein a time zone wheel is also integral with the arbour (60) carrying the true running equation hour hand, wherein a difference and display train coupled to the true equation motion work makes it possible to apply, to the true running equation hour, the time difference associated with the longitude position of a user relative to the centre of the time zone in which the user is located, wherein the time zone wheel makes it possible to apply, to the arbour carrying the true running equation hour hand, in forward or backward steps of one hour, the difference between the true running equation hour and the civil hour at the place where the user is located, wherein the running equation minute pipe drives the true running equation minute pipe by friction, and wherein the running equation minute pipe is connected to the true running equation minute pipe by indenting.