Earth slows done. Days are getting longer by 1-2 milliseconds every thousands of years. Moreover, Earth rotation also depends on the position of Earth relatively to the sun. Those are small effects, but important for precision.
Earth slows done. Days are getting longer by 1-2 milliseconds every thousands of years. Moreover, Earth rotation also depends on the position of Earth relatively to the sun. Those are small effects, but important for precision.
RE: Defining time with atomic fountains