Visual Astrology [ Back to Visual Astrology ]



Snapshots of Earth at a Birth


Much of this will be clear through study on your part. I have found that it is very difficult to explain these different coordinate systems in words. Illustrations help a lot and drawing out your own horizon helps most of all. I apologize for the awkwardness of this presentation and can imagine an entire book devoted to a careful presentation of these three coordinate systems.


Ecliptic or Zodiac Sphere


Let us review these systems once again. We will examine some diagrams that represent the systems at work in a natal chart. Be sure you understand each of the following statements:

  • The birth day is July 18, and the Earth is at 295° or 25° Capricorn along the plane of the ecliptic.
  • The Sun in this natal chart is at 25° Cancer or 115° of Absolute Longitude.


Equatorial Sphere or Equator


  • It is Summer in the northern hemisphere since the arctic circle is exposed to the Sun.
  • Half the Earth is in darkness, half in light.
  • Noon is that point on the Earth that is in line with the Earth/Sun axis in Figure A.
  • The time of birth is in the later afternoon.

Figure B represents the Earth and/or the celestial sphere. The zodiac or ecliptic is surrounding the Earth, and the North Pole tilted toward the solstice point. Then:

  • A late afternoon birth puts the birthplace to the right of the Earth/Sun line and toward the twilight region of the globe.
  • The birth geographic latitude is 40°.
  • A line from the North Geographic Pole (or celestial pole) through the birthplace and on to the South Pole represents the RAMC for this birth.
  • The point where it cuts or intersects the zodiac is the M.C. (25° Virgo).


Equator or Equatorial Sphere


  • The Zenith (Z) extends out above the birthplace (dark dot).
  • The plane of the horizon is 90° from the zenith.
  • The intersection of the horizon to the zodiac at 7° of Sagittarius and Gemini marks the ascendant and descendant axis.
  • The horizon system is oriented or tilted toward 7° Virgo. This point is called the Nonagesimal, a point on the ecliptic +/- 90° from the ascendant/descendant axis and near the zenith.
  • The Prime Vertical intersects the ecliptic to form the vertex and anti-vertex.


© Copyright © 1997 Michael Erlewine







Popular Software

Win*Star 6.0 Win*Star 6.0

Blue*Star Blue*Star