Would an ancient world philosopher/scientist be able to ascertain the altitude of clouds?
We're assuming that he does not live near a mountain that's tall enough to actually pierce the clouds.
How would one go about such thing? I feel like figuring out the altitude of clouds is actually harder than, say, calculating the circumference of the earth, because clouds are always moving, doing so in difficult to predict ways, and are just translucent enough that their shadows are soft-edged and hard to measure