The Measure of the Earth The Size of the Earth
The problem facing a culture that wants to measure Heaven and Earth is that there is no real connection between the two. On Earth, something has length. In the sky, everything is an angle. For the centuries we term the Dark Ages, this fact was given as a reason for why what was up there could not possibly be related to what was down here--a doctrine that suited the Church.
The only part of the Earth that clearly relates to time is the equator, since in the course of a sidereal day, relative to the stars, the Earth rotates exactly once. While...