The headword phrase appears at, and is evidently extracted from, Homer, Iliad 3.3 (web address 1): the Trojans rally for battle against the Achaeans with a clamor like cranes before the front of heaven.
The principal element in it is derived from ou)rano/s (heaven; see generally LSJ s.v.); the form ou)rano/qi is adverbial of place (Smyth §342, web address 2).
[1] The gloss follows a scholion (of Aristonicus) to the aforementioned passage.