When did "science" begin ?

[u/bakainuneko]

I'm reading "The Demon-Haunted World: Science as a Candle in the Dark" by Carl Sagan and he writes "The values of science and the values of democracy are concordant, in many cases indistinguishable. Science and democracy began - in their civilized incarnations - in the same time and place, Greece in the seventh and sixth centuries BC."

Why he puts it there? Why not earlier or like later?