[Mark] describes the clock as “a four train, quarter striking movement with the fourth train driving the astronomical systems ... to keep track of the Sun-Earth-Moon system and a full ...

When highly accurate atomic clocks were developed in ... 2016. Since the Earth has sped up, scientists believe each astronomical day in 2021 will be 0.05 milliseconds shorter, and over the course ...

Our clocks will spring forward at 2 a.m ... over the equator" dictate the equinoxes and solstices of astronomical seasons. The Earth's axis tilts approximately 23.5 degrees on its axis ...