The Sun and Moon Are Hot, but How Does It Warm Us?

Aristotle denied that the sun is hot, so how does it warm us? He flirted with the possibility of invoking friction, but this makes little sense. Ptolemy did not really solve this problem either, but simply associated various planets with certain elemental properties. Platonus took a great interest in astrology, devoting a treatise to the topic,. and discussing it at length in other treatises.