observer's meridian

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Definitions from WordNet

Noun observer's meridian has 1 sense

observer's meridian - a meridian that passes through the observer's zenith
--₁ is a kind of meridian, longitude, line of longitude

Definitions from the Web

Observer's Meridian

Noun: Observer's Meridian refers to the imaginary line passing through the observer's zenith and connecting the celestial poles. It is used as a reference point for determining the hour angle and declination of celestial objects.

Example sentences:

The observer's meridian is crucial for accurately measuring the celestial coordinates of stars.
By aligning their telescope with the observer's meridian, astronomers can track the movement of planets and other celestial bodies.
When the star crosses the observer's meridian, it is said to be at its highest point in the sky.