Astrology Notes - Herong's Notes - v2.13, by Herong Yang
The Celestial Meridian and Zenith
This section describes the celestial meridian and zenith.
The relative coordinate system on the celestial sphere is defined relatively to an observer on the Earth:
The following picture provides a good illustration of the coordinate system on the celestial sphere:
The word "Meridian" is an ancient word meaning midday. When telling time, we use the letters a.m. to indicate morning for ante meridiem, which is Latin for "before midday." We use p.m. for post meridiem, or "after midday."
Table of Contents
Quick Introduction to Astrology
►Basics of Astrology and Astronomy
The Celestial Sphere Coordinate System
►The Celestial Meridian and Zenith
The Precession - Rotation of Earth's Axis
Introduction to Western Zodiac Signs
Horoscope and Horoscopic Astrology