He also observed how very hot metal turns white, the colour of the Sun.

I really hate the fact that this logic makes sense.

Edit: For the uninitiated, "it's the same color as the sun therefore the sun is hot" is the kind of natural philosophy "proof" that we usually laugh about today, but in this case it's actually accurate because in both cases it's black body radiation at work.

Aristoteles was a dumb motherfucker with loads of shot ideas.

I know Aristotle sounds stupid but I don't see how da Vinci disproved it.

Aristotle said the sun itself wasn't hot but created heat through friction. So the heat came off the sun because of that friction. You can focus that heat no matter the source.

A more knowledgeable (but still inaccurate) Aristotle could have argued: The hydrogen (quintessence) that makes up the sun doesn't have intrinsic heat but heat is created through gravitational compression and fusion.

I don't see how a concave mirror disproves Aristotles theory. Why wouldn't concentrating the friction rays also result in more heat?

As for the second bit, the sun isn't made out of metal. And metal isn't the only thing that turns white. Dog shit used to turn white, but not because of heat.

Nice meme (funny) 👍

Just saw that last night! I had had no idea we ever thought like that.