Looking Up: Turn, turn, turn

This is best read to the Peter Seeger tune of "Turn!, Turn!, Turn!...").Spinning seems to be the way of the Universe. We're always going around in circles.In 340 B.C., Heraclides claimed that the Earth spins. We might imagine what they thought of him. Heraclides was a Greek philosopher and astronomer, having lived from 387 to 312 B.C. he proposed that the apparent rotation of the Sun across the sky by day and the stars by night, was caused by the world turning around once every 24 hours. [...]