Astrology Terms: Letter D

Browse 6 astrology terms starting with the letter D.

Reviewed byKenneth O. Patterson·Astrologer & Content Director

Showing 6 of 92 terms

D

Decan

A subdivision of each zodiac sign into three 10-degree segments. Each decan modifies the sign's expression, with the first decan being the purest expression of the sign.

Degree

The unit of measurement used in astrology. Each zodiac sign spans 30 degrees, and the entire zodiac circle contains 360 degrees. Planet positions are measured in degrees within their sign.

Descendant

The point directly opposite the Ascendant, marking the cusp of the 7th house. It represents the qualities you seek in partners and how you relate in one-on-one relationships.

Detriment

A position of difficulty where a planet is in the sign opposite its rulership. For example, Mars in Libra (opposite Aries) or Venus in Scorpio (opposite Taurus).

Dignity

A system for evaluating planetary strength based on sign placement. A planet in its own sign (domicile) or exaltation is considered dignified and functions well.

Direct

When a planet resumes its normal forward motion through the zodiac after a retrograde period. Going direct signifies renewed forward momentum in the planet's domain.

Frequently Asked Questions

What is an astrology glossary?▾
An astrology glossary is a comprehensive reference that defines the specialized terminology used in astrological practice. It covers zodiac signs, planets, houses, aspects, chart types, and advanced concepts like dignity, decan, and sect, helping beginners and experienced practitioners alike communicate clearly about astrological topics.
How many terms does astrology use?▾
Professional astrology uses hundreds of technical terms. This glossary covers over 80 of the most essential terms, including all 12 zodiac signs, 10 planets, 12 houses, 6 major aspects, 7 chart types, and dozens of key concepts like retrograde, stellium, and chart ruler.
What is the difference between a sign, a planet, and a house?▾
In astrology, planets represent fundamental drives (what energy), signs describe how those drives express themselves (how the energy manifests), and houses indicate where in life the energy plays out (which life area). For example, Venus (love) in Scorpio (intensely) in the 7th house (partnerships) describes someone who loves deeply and passionately in close relationships.
Do I need to know all these terms to read a birth chart?▾
No. Start with the basics: the 12 zodiac signs, the 10 planets, and the concept of houses. As you gain experience, you can explore more advanced terms like aspects, dignities, and chart patterns. This glossary is organized alphabetically so you can look up terms as you encounter them.