Where does “αστρονομία” come from?

αστρονομία (Greek) comes from Ancient Greek ἀστρονομία, from Ancient Greek ἄστρον, from Ancient Greek ἀστήρ, from Proto-Hellenic astḗr, from Proto-Indo-European h₂stḗr, from Proto-Indo-European h₂eHs- — to be/become dry; to burn, to glow; hearth.

αστρονομία (Greek): astronomy