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 Relative 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

 About This Book

 Quick Introduction to Astrology

Basics of Astrology and Astronomy

 What Is Astronomy

 The Solar System

 The Celestial Sphere

 The Celestial Sphere Coordinate System

The Celestial Meridian and Zenith

 The Ecliptic

 The Precession - Rotation of Earth's Axis

 Stars

 Constellations

 Introduction to Western Zodiac Signs

 Horoscope and Horoscopic Astrology

 Horoscope and Planets

 Chinese Astrology and Horoscope

 Chinese Zodiac Animal Signs

 References

 PDF Printing Version