Astrology Glossary
35 essential terms you need to know when reading a chart
Ascendant
The zodiac sign rising over the eastern horizon at the moment of birth, marking the cusp of the 1st house. It represents outward demeanor, first impressions, and social persona.
Aspect
The angular relationship between two planets. The five major aspects are conjunction (0 degrees), sextile (60 degrees), square (90 degrees), trine (120 degrees), and opposition (180 degrees).
Cardinal
One of three modalities. Cardinal signs (Aries, Cancer, Libra, Capricorn) mark the beginning of each season and carry initiating, leadership-oriented energy.
Composite Chart
A chart created by calculating the midpoint of each planet between two people's charts. It represents the character and direction of the relationship itself.
Conjunction
An aspect where two planets occupy the same position (approximately 0 degrees apart). Their energies merge and intensify each other.
Cusp
The boundary line between two houses or two signs. For example, the 7th house cusp is the point where the 7th house begins.
Descendant
The point directly opposite the Ascendant, marking the cusp of the 7th house. It represents partnerships, marriage, and how you relate to others.
Domicile
The zodiac sign a planet rules. A planet in its domicile (e.g., Mars in Aries/Scorpio, Venus in Taurus/Libra) operates most naturally and powerfully. It is the strongest of the four essential dignity states (domicile, exaltation, detriment, fall).
Element
A system dividing the twelve signs into four groups: Fire (Aries, Leo, Sagittarius), Earth (Taurus, Virgo, Capricorn), Air (Gemini, Libra, Aquarius), and Water (Cancer, Scorpio, Pisces).
Fixed
One of three modalities. Fixed signs (Taurus, Leo, Scorpio, Aquarius) fall in the middle of each season and embody persistence, stability, and determination.
House
One of twelve divisions of the chart, each governing a specific area of life such as identity (1st), finances (2nd), communication (3rd), home (4th), creativity (5th), and so on through career (10th) and beyond.
IC (Imum Coeli)
The lowest point of the chart, marking the cusp of the 4th house. It represents family, roots, and your innermost foundation. It sits directly opposite the Midheaven.
Jupiter Return
An event occurring roughly every 12 years when Jupiter returns to its natal position. It heralds a phase of growth, opportunity, and expansion.
MC (Medium Coeli) / Midheaven
The highest point of the chart, marking the cusp of the 10th house. It represents career, public reputation, and material achievements in the eyes of society.
Modality
A system dividing the signs into three groups: Cardinal (initiators), Fixed (sustainers), and Mutable (adapters). Each modality reflects a different role within the cycle of the seasons.
Mutable
One of three modalities. Mutable signs (Gemini, Virgo, Sagittarius, Pisces) fall at the end of each season and embody adaptability, flexibility, and comfort with change.
Natal
Meaning 'of or relating to birth.' A natal chart is the birth chart, and natal planets are the planetary positions at the moment of birth.
Node (North Node)
One of two points where the Moon's orbit crosses the ecliptic (the Sun's apparent path). The North Node represents the life lessons, growth direction, and qualities you are moving toward in this lifetime.
Node (South Node)
Directly opposite the North Node, it represents innate talents and familiar patterns from the past. It is a point of comfort, but over-reliance on it can hinder growth.
Opposition
An aspect where two planets are 180 degrees apart, facing each other across the chart. It creates a dynamic tension that calls for balance and awareness of opposing forces.
Orb
The allowed margin of deviation from an exact aspect angle. For example, a trine at 118 degrees instead of exactly 120 degrees is still valid if within an orb of 2 degrees. Tighter orbs indicate stronger influence.
Planet
In astrology, 'planets' include the Sun and Moon alongside Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto -- ten celestial bodies in total, each representing a different type of energy.
Retrograde
An optical illusion in which a planet appears to move backward through the zodiac as seen from Earth. Astrologically, it signals a period of reflection, review, and revision in the areas that planet governs.
Rising Sign
Another name for the Ascendant -- the zodiac sign that was rising on the eastern horizon at the time of birth. It changes approximately every two hours.
Ruling Planet
The planet that governs a zodiac sign. The modern rulers are: Aries-Mars, Taurus-Venus, Gemini-Mercury, Cancer-Moon, Leo-Sun, Virgo-Mercury, Libra-Venus, Scorpio-Pluto, Sagittarius-Jupiter, Capricorn-Saturn, Aquarius-Uranus, Pisces-Neptune.
Saturn Return
A major astrological event occurring roughly every 29 years, when Saturn returns to its natal position. It marks a period of serious reflection on adult responsibilities and life structure.
Sextile
A harmonious aspect where two planets are 60 degrees apart. It is gentler than a trine and represents opportunities that can be realized when you take initiative.
Sign (Zodiac Sign)
One of twelve 30-degree segments of the ecliptic, from Aries through Pisces. Each sign carries a distinct set of qualities and energy patterns.
Square
A tense aspect where two planets are 90 degrees apart. It creates friction and challenges, but also provides strong motivation for action and growth.
Synastry
The astrological technique of comparing two birth charts to analyze relationship dynamics. It primarily examines cross-chart aspects and house overlays.
Transit
The influence that occurs when a currently moving planet forms an aspect to a planet in your birth chart. Transits are used to understand timing and life changes.
Trine
The most harmonious aspect, where two planets are 120 degrees apart. Energy flows effortlessly, often indicating natural talents or areas of ease and good fortune.
Zodiac
The 360-degree belt along the ecliptic (the Sun's apparent path) divided into twelve signs. It forms the foundational framework of Western astrology.
Birth Chart
A map of the sky drawn for the exact time and place of your birth. Also called a natal chart. It shows how 10 planets are distributed across 12 signs and 12 houses.
Chiron
The asteroid Chiron is known as the 'wounded healer.' Its position in your birth chart shows where you carry deep wounds but also where you can heal others through those experiences. It plays an important role in synastry as well.
Decan
Each zodiac sign (30 degrees) is divided into three 10-degree segments called decans. The 1st decan (1-10°), 2nd decan (11-20°), and 3rd decan (21-30°) give different nuances to the same sign, explaining why people of the same sign can be quite different.
Quincunx (Inconjunct)
An aspect formed when two planets are 150 degrees apart. It is the most discussed aspect after the five major ones. It represents energies with nothing in common that require adjustment. Though uncomfortable, adaptation can turn it into a unique talent.
Solar Return
A chart cast for the exact moment each year when the Sun returns to the same position it held at your birth. It occurs around your birthday and reveals the major themes and energies for the year ahead. It forms the basis of annual forecast analysis.
Stellium
A cluster of three or more planets in the same sign or house. It concentrates energy powerfully in that area, making the themes of that sign or house stand out prominently in your life. It is one of the first patterns beginners notice in a chart.
Exaltation
The sign where a planet expresses itself most clearly after its domicile. Less natural than home but still highly favorable — the planet's energy is elevated and articulated. Traditionally applied to the seven classical planets only: Sun in Aries, Moon in Taurus, Mercury in Virgo, Venus in Pisces, Mars in Capricorn, Jupiter in Cancer, Saturn in Libra.
Detriment
The sign opposite a planet's domicile. The planet operates in an environment at odds with its own nature, expressing itself weakly. Example: Mars rules Aries and Scorpio, so its detriment is Libra and Taurus. The planet struggles to act in its native mode.
Fall
The sign opposite a planet's exaltation. The planet is at its weakest, considered even more challenging than detriment. Example: the Sun is exalted in Aries, so its fall is Libra. The planet's energy is most subdued here.