Ruling Planet
Ruling Planet is the natural ruler of each sign. For example, Mars rules Aries, Venus rules Taurus. The ruling planet's chart position strengthens that sign's energy.
Related Terms
Cusp
The transition point where one sign ends and another begins. People born in the cusp zone may carry characteristics of both signs.
Exaltation
The sign where a planet expresses itself most powerfully and harmoniously. For example, the Sun is exalted in Aries, the Moon is exalted in Taurus.
Decan
Dividing each sign into three 10-degree segments. Each decan is ruled by a different planet, explaining differences between people of the same sign.
Detriment
A planet placed in the sign opposite to the one it rules. The planet's energy is expressed with difficulty and requires extra effort.
Modalities
The threefold classification of signs by seasonal position: Cardinal (initiating), Fixed (sustaining), Mutable (adapting). Each element group contains three signs.
Elements
The four fundamental energy groups dividing the zodiac: Fire (Aries, Leo, Sagittarius), Earth (Taurus, Virgo, Capricorn), Air (Gemini, Libra, Aquarius), Water (Cancer, Scorpio, Pisces).