Where does “οὐρανοσκόπος” come from?

οὐρανοσκόπος (Ancient Greek) comes from Ancient Greek σκοπέω, from Ancient Greek σκοπός, from Ancient Greek σκέπτομαι, from Proto-Hellenic sképťomai, from Proto-Indo-European spéḱyeti, from Proto-Indo-European speḱ- — to see, to look, to observe.

Ancestry of “οὐρανοσκόπος”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	σκοπέω	I look, look at, behold; I examine, inspect; 413...
2	Ancient Greek	σκοπός	watcher, lookout; protector, guardian; spy, scout
3	Ancient Greek	σκέπτομαι	I look at, examine; I examine, consider, think
4	Proto-Hellenic	sképťomai	to look at
5	Proto-Indo-European	spéḱyeti	to be looking at, to keep looking at
6	Proto-Indo-European	speḱ-	to see, to look, to observe

Every word from Proto-Indo-European speḱ- →