Excellent question! Not having our astronomer available at the moment to confirm, our best guess is that it might have something to do in part with the variations in Earth’s orbit around the Sun (which involves the Earth/Moon orbit around a barycenter), and perhaps gravitational influences of other planets.
Excellent question! Not having our astronomer available at the moment to confirm, our best guess is that it might have something to do in part with the variations in Earth’s orbit around the Sun (which involves the Earth/Moon orbit around a barycenter), and perhaps gravitational influences of other planets.