Who was the first philosopher-scientists to demonstrate that the earth actually is spherical?

Answer 1

but socrates wasn't the first philosopher either ... the first philosopher was (Anaximander) also greek.

Answer 2

no you are wrong socrates was before him.. socrates was born 470 bc and died 399 bc don't get confused the years were not increasing but decreasing .. so aristotle came after socrates and his considered as the founder of philisophy .. and he was student of plato and plato was student of socrates so aristotle comes even after plato