Universal Speed in an Elephant Sanctuary
Pale Blue Pod
00:00
The Sun Is Spiraling Around the Center of the Universe
When people thought the Earth was the center of the universe, they would have to explain things like retrograde motion and seeing planets move in a way that didn't make it seem like those planets were moving around us. So they explained it using epicycles. The sun moves on one of these epicyclic orbits. It's kind of like take a slinky, take a giant slinky and stretch it around so that it makes a circle so that it connects with itself. And that's what the sun is doing. There they go. Things really are moving. They're booking it out there.
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