Well, actually, it isn't orbiting just around the center of mass of the solar system (solar system barycenter), but that is just one of the two foci of the eart

Well, actually, it isn't orbiting just around the center of mass of the solar system (solar system barycenter), but that is just one of the two foci of the earth's elliptical orbit. The error is of a similar magnitude as assuming the center of the sun vs barycenter of the solar system. If you're going to be pedantic, get it right. This article is a much better technical explanation of the orbit, including both the moving center of mass and the elliptical orbit: https://socratic.org/questions/is-the-sun-directly-in-the-center-of-earth-s-orbit https://socratic.org/questions/is-the-sun-directly-in-the-ce... Oh, and the earth's orbit is also distorted by proximity to other gravitational masses, most notably the moon, but we're not going to be /that/ pedantic. Side note: the phrase "Well, actually," was banned at my house. Not sure why...