In astrology there are two other definitions of meridian: 1. Meridian - any circle passing through north and south points of horizon. 2. Meridian - any circle perpendicular to local horizon.
Such defined 'meridian' circles cut astronomy meridian circles.
Passing through the zenith
I get what the local meridian is, but since the celestial meridian is a feature of the celestial sphere, is saying it will pass through the zenith a true statement for any location on Earth? It seems like that would only occur at the equator. (Look at what would happen at the poles.) — Elliot Winkler 05:24, 3 September 2012 (UTC)
This article is confusing and contains at least one error, can someone please fix these problems.
I came to this article to find out what types of meridian there are in astronomy and I am still confused, despite having a good understanding and ability to use right ascension and declination and plenty of experience doing so as an amateur astronomer.
The various definitions of and types "meridian" need to be carefully distinguished, preferably by means of clear diagrams.
I copied this paragraph from the article. It seems to contradict the definition of meridian given. If a celestial object viewed from England, and it crosses the line joining the north celestial pole and the horizon, ie passes "under" the NCP, it will reach it's LOWEST point as it crosses the meridian.
"Because the meridian is fixed to the local horizon, a celestial object will appear to drift past the local meridian as the Earth spins. It reaches its highest point in the sky when crossing the meridian (culmination). Using an object's right ascension and the local sidereal time it is possible to determine the time of its culmination (see hour angle)." — Preceding unsigned comment added by Mark Matthew Dalton (talk • contribs) 02:18, 14 January 2014 (UTC)