Celestial meridian
= Celestial meridian
An observer’s <celestial meridian> is the <great circle> containing the <zenith> and the <celestial poles>. Its upper half passes through the local north and south directions.
= Celestial meridian
An observer’s <celestial meridian> is the <great circle> containing the <zenith> and the <celestial poles>. Its upper half passes through the local north and south directions.