noun
astronomical zenith
Rare technical term in astronomy for the point directly overhead in the celestial sphere, as defined by the local vertical.
天文天頂は、観測者の真上の天球上の点を指す。
The astronomical zenith refers to the point on the celestial sphere directly above the observer.
Compound of 天文 (astronomy) and 天頂 (zenith), directly translating the English term 'astronomical zenith'.