Fun facts about earth Earth revolves or orbits around the sun. But, its orbit isn't perfect. It is an oval shape, and that is the sole reason why we have leap year. ever year, right after the last leap year, the year gets longer by 6 hours. After leap year, the time resets. Every hundred years, days get longer by 1.8 milliseconds but every 100 years the year gets shorter by about 0.55 seconds.
