Happy New Tropical (or Anomalistic or Sidereal) Earth Orbital Time Period!

[I decided a while ago to make this post an annual BA tradition on January 1, which is a more polite way of saying it's a repost and I'm sometimes a tad on the lazy side. I've punched it up here and there over the previous version, added a number (can you find it?), and switched up the images, just to make it fresher. Enjoy.] Yay! It's a new year! But what does that mean, exactly? The year, of course, is the time it takes for the Earth to go around the Sun, right? Well, not exactly. It depends o...