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I've come up with a fairly simple means of measuring/calculatingReading this work gave me an eerie sensation, akin to hearing from Harrison that he timed his chronometers by means of a star transit past a nearby building, and computed the ratio of day lengths proportionately.
the size of the earth using only local measurements (not requiring
multiple sightings at far away locations like Eratothenes' method
needs).
The idea is to observe and time the motion of the terminator at
sunset/sunrise ascending or descending the face of a building...
David Bowman