Planets and houses in Western astrology
A Western birth chart is a map of the sky for one moment and place. The planets describe what is happening — the drives and functions of a personality — while the houses describe where in life it plays out. This guide explains both, and how Western practice compares with the Vedic approach.
The personal planets
The inner, faster-moving bodies change sign often, so they are the most individual part of a chart.
- Sun — identity, vitality, purpose and the conscious will. It takes about a month to cross each sign.
- Moon — emotions, habits, comfort and the need for security. It changes sign roughly every two and a half days.
- Mercury — thinking, speech, learning, travel over short distances and everyday exchange.
- Venus — affection, pleasure, values, beauty and how you relate to others and to money.
- Mars — drive, courage, desire and how you assert yourself or handle conflict.
The social planets
- Jupiter — growth, optimism, belief, generosity and opportunity. It spends about a year in each sign.
- Saturn — structure, responsibility, limits, time and maturity. It spends about two and a half years in each sign, and its return to its natal position around age 29 is a well-known milestone in Western practice.
The outer planets
Uranus, Neptune and Pluto move so slowly that whole age groups share the same sign, so astrologers read them mainly by house and by their aspects to personal planets.
- Uranus — change, independence, invention and the unexpected.
- Neptune — imagination, compassion, spirituality, and also confusion or idealism.
- Pluto — power, depth, transformation and renewal. Astronomers reclassified Pluto as a dwarf planet in 2006, but astrologers continue to use it.
Many Western astrologers also use the lunar nodes, the asteroid Chiron and a handful of other points. Vedic astrology, by contrast, uses only the seven visible planets plus Rahu and Ketu; see the nine grahas.
The angles
Four points frame every chart: the Ascendant (the degree rising in the east), the Descendant opposite it, the Midheaven or MC (the highest point of the ecliptic) and the Imum Coeli or IC opposite that. The Ascendant changes sign about every two hours, which is why birth time matters so much. In most house systems the angles mark the cusps of the 1st, 4th, 7th and 10th houses.
The twelve houses
| House | Common themes | Type |
|---|---|---|
| 1 | Self, appearance, first impressions, approach to life | Angular |
| 2 | Money, possessions, self-worth, resources | Succedent |
| 3 | Communication, siblings, neighbours, early learning, short trips | Cadent |
| 4 | Home, family, roots, private life | Angular |
| 5 | Creativity, romance, play, children, self-expression | Succedent |
| 6 | Daily work, routines, service, wellbeing habits | Cadent |
| 7 | Partnerships, marriage, close collaborators, open rivals | Angular |
| 8 | Shared resources, intimacy, inheritance, deep change | Succedent |
| 9 | Higher learning, travel, philosophy, belief, publishing | Cadent |
| 10 | Career, reputation, public role, ambition | Angular |
| 11 | Friends, groups, networks, hopes and goals | Succedent |
| 12 | Solitude, the unconscious, retreat, spirituality, hidden matters | Cadent |
Angular, succedent and cadent
Angular houses (1, 4, 7, 10) begin at the angles and are traditionally the strongest places for a planet to act visibly. Succedent houses (2, 5, 8, 11) follow them and are linked with stability and resources. Cadent houses (3, 6, 9, 12) “fall away” from the angles and are linked with learning, adjustment and transition. Jyotish has a parallel scheme: kendras, panaparas and apoklimas, alongside its own groupings such as trikonas and dusthanas described in the twelve bhavas.
House systems
Dividing the sky into twelve houses is not as simple as it sounds, because the ecliptic is tilted relative to the horizon. Astrologers have devised many systems, and the choice is one of the longest-running debates in Western astrology.
- Placidus — the most common modern system. It divides the time each degree takes to travel from horizon to meridian. Houses can be very unequal, and the system breaks down near the polar circles.
- Koch — another time-based quadrant system, popular in parts of Europe.
- Equal house — twelve 30° houses measured from the Ascendant degree. Simple and works at any latitude, but the MC can fall in the 9th, 10th or 11th house.
- Whole sign — the rising sign is the whole 1st house, the next sign the 2nd, and so on. The oldest known system, used in Hellenistic and Vedic astrology and increasingly revived in the West.
- Porphyry, Regiomontanus, Campanus — older quadrant systems with their own followers, especially in horary work.
A planet near a house cusp can move into a different house depending on the system, so if a reading feels off it is worth checking which system was used.
Rulers and planets in houses
Each house is coloured by the sign on its cusp and by that sign’s ruling planet. If Leo is on your 10th house cusp, for example, the Sun is said to rule your 10th house, and wherever the Sun sits shows where career themes connect in your life. Planets inside a house add their own energy to its themes. Western and Vedic astrologers both use this chain of rulership, which is one of the clearest signs of their common ancestry.
Putting it together
A useful way to read any placement is as a sentence: the planet (what) expresses itself in the style of the sign (how) in the area of the house (where), shaped by its aspects (in relation to what else). Venus in Gemini in the 5th house, for instance, might describe someone who enjoys lively, witty romance and creative play with words. Aspects are covered in planetary aspects, Western and Vedic.
Frequently asked questions
What if a house has no planets?
Empty houses are normal; ten planets cannot fill twelve houses. The house is then read through the sign on its cusp and the condition of its ruling planet.
Which house system should I use?
Start with the one your teacher or main reference uses, and stay consistent. Placidus is the Western default; whole sign is used by Hellenistic and Vedic practice, and by our Vedic birth chart calculator.