[RightWhale]

Celestial bodies used as a clock: a clock of some kind is needed to determine longitude.

Gen 1:14 . . . lights in the firmament . . . let them be for signs, and for seasons, and for days, and years:

Whoever translated this dropped an extra comma into his parallel construction and nearly destroyed it, but the intent could be that the stars and planets were intended to be used to tell time, and were so used many years B.C. at the time the Books of Moses were written.

[aruanan]

Was it Eratosthenes who calculated the circumference of the earth by measuring the incident angle of sunlight in well shafts at noon at two distant points?