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The circle of the zodiac, like any other circle, is divisible into 360 degrees. Within this circle move the heavenly bodies of our solar system, but their motion is far from uniform, as shown in the first chapter. Therefore those planets which move the slowest are overtaken, passed, and re-passed by the swifter bodies.

When one planet is a certain number of degrees from another planet they are said to be in aspect.


The Opposition planets are 180 degrees apart.
The Square planets are 90 degrees apart.
The Sextile planets are 60 degrees apart.
The Trine planets are 120 degrees apart.
The Conjunction planets are 0 degrees apart.

The Parallel occurs when two planets have the same degree of declination, no matter whether one is north and the other south of the equator. This will be made clear in calculations which follow later.