I first want to review with you briefly what we know about circular orbits, so I wrote on the blackboard everything we know about circular orbits.

And if so, does the apple deserve a separate line on our list from the roundness and redness?

In fact, 21st century astronomers would identify it as a planetary nebula, but it's not a planet either, even though it may appear round and planet-like in a small telescope.

And we have a very old silver spoon, round in the bowl like a little ladle, and marked with the same castle.

It was round so that there was no one at the head of the table (which is where the most important person would usually sit) and Arthur and his knights were all equal.