On 2/24/2018 2:14 PM, Caleuche wrote:
>  a realization that the Earth
> was approximately spherical and that a pretty good estimate of its
> circumference was made by Eratosthenes in 240 BC (252000 "stades", which
> was somewhere between 24663 and 27967 miles).
A figure that was met with some skepticism, as I recall, because it was
hard to imagine that the "known world" could be such a small fraction of
all that "terra incognita", if correct.  Shades of the problem of "dark
matter" today...

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Kelly St. Clair
xxxxxx@efn.org