> For a long time, they didn't like irrationals, so anything involving those didn't count as mathematics. Note that this is more or less a myth. > Greek geome

> For a long time, they didn't like irrationals, so anything involving those didn't count as mathematics. Note that this is more or less a myth. > Greek geometers knew they lived on a sphere, but spherical geometry was too unpleasant to contemplate until quite recently Astronomers did a huge amount of sophisticated spherical geometry, from Mesopotamians through e.g. Hipparchus and later Ptolemy, then Arabs/Persians, Indians, medieval Europeans, right down to the present.