https://www.newscientist.com/article/2170764-a-day-used-to-be-less-than-19-hours-long-1-4-billion-years-ago/ > Over the course of many thousands of years, Earth’s way of moving through the solar system goes through cyclical changes. The planet’s elliptical orbit shifts around the sun like a hula hoop, and the shape of the orbit itself wobbles between … > To continue reading this premium article, subscribe for unlimited access.