23
votes
Accepted
How did Ptolemy know that days were unequal lengths?
You are right: at the time of Ptolemy they could not measure
the length of a day directly. Actually Ptolemy never discusses any clocks in his book, he probably used some crude devices
record the ...
- 47.5k
9
votes
Accepted
Where did the popular idea of spacetime come from?
A nice history was given by Archibald, R.C. (1914), "Time as a fourth dimension", Bull. Amer. Math. Soc., 20 (8): 409–412
https://doi.org/10.1090%2FS0002-9904-1914-02511-X
Regarding Wells, ...
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