Earth's orbit is an ellipse, not a perfect circle. Earth's distance from the Sun varies by about 3 million miles throughout the year. Earth's orbit's semimajor axis is approximately 93 million miles.

Summer is only a couple days old, and already we’re baking. As I write these words, the temperature outside of my California desert home is hovering at 118 degrees F, and there’s no sign of it letting ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. When Johannes Kepler made the intuitive leap in the early 1600s to realize that planetary orbits ...