What do the 12 houses mean in a birth chart?

What are the houses in a birth chart?

They are twelve divisions of the sky as seen from one place at one moment. Picture two frames laid over each other. The zodiac is a band of twelve equal signs along the Sun’s apparent yearly path, and it turns with the sky. The houses are fixed to where you stand, anchored to the horizon and the meridian. Every day the turning sky carries each sign, and each planet, through every house in turn. A planet’s sign and its house are two separate facts about it.

Calculated: in the Placidus house system, four of the twelve dividing lines come straight from the horizon and the meridian. The Ascendant, the zodiac degree rising in the east, begins the 1st house; the IC begins the 4th; the Descendant, setting in the west, begins the 7th; and the Midheaven, where the zodiac crosses the meridian, begins the 10th. The other eight lines are worked out between them. In whole-sign houses those four points fall inside houses instead.

How it is traditionally read: the tradition reads a planet’s sign as how it acts and its house as where in life it acts. The same Venus is read one way in the 2nd house and another in the 7th. That pairing is a convention of interpretation; nothing in the calculation gives a house its meaning.

What houses are not: the 1st house is not Aries, and the 2nd is not Taurus. Some modern teaching pairs each house with the sign of the same number as an aid to memory, but a chart’s houses begin wherever the horizon fell. In the example chart below, the 1st house begins in Aries and the 2nd in Gemini.

How are the house lines calculated?

From the birth time, the latitude and longitude of the birthplace, and the tilt of the Earth’s axis. Those give the Ascendant and the Midheaven. The house system then decides where the other lines go. Placidus, the most common modern system, divides by time: each of the three houses between the horizon and the meridian takes an equal share of the time a point of the zodiac spends travelling between them, above the horizon and below it.

Calculated: follow the Sun through one day at Greenwich, 1 January 2000, in the example chart’s houses. It crossed the Ascendant at 08:12 UTC into the 12th house, passed through the 11th and the 10th, crossed the Midheaven at 12:03 and the Descendant at 15:54. Each of the six houses above the horizon held it for about 1 hour 17 minutes; each of the six below, through the long winter night, for about 2 hours 43 minutes. The daily turn carries it through the houses in falling order, 12, 11, 10, against the way they are numbered.

A note on sunrise: the Ascendant is the geometric horizon. The published sunrise that morning, about 08:06 UTC, is earlier because it marks the moment the top edge of the Sun appears, with the bending of light near the horizon allowed for. The centre of the Sun crossed the geometric horizon, and so the Ascendant, at 08:12.

On your OrbHeaven chart: houses are Placidus, named next to the Placements heading, and the House cusps list gives the degree where each house begins. The universal time the chart was cast for is printed at the foot.

Why are some houses bigger than others?

Because Placidus divides time, not the zodiac. The zodiac is tilted against the equator, so some stretches of it rise quickly and others slowly, and a house of equal time can hold few degrees or many. The difference grows with distance from the equator. Opposite houses are always the same size. And because houses and signs are different divisions, a house can contain a whole sign, and a sign can contain the start of two houses.

Calculated: in the example chart the 3rd and 9th houses span 17.6° each, and the 6th and 12th 56.6°. At the same moment on the equator the houses would range from 27.7° to 32.5°; at 60° north, from 12.7° to 80.6°. Taurus, Virgo, Scorpio and Pisces each lie wholly inside one house, while Gemini, Cancer, Sagittarius and Capricorn each hold two cusps.

On your OrbHeaven chart: beyond the polar circles, at about 66½° north or south, some of the zodiac never rises or never sets, and Placidus cannot always be calculated. Where it cannot, the chart uses whole-sign houses and says so.

What is a house cusp, and what if a planet sits near one?

A cusp is the line where a house begins, written as a degree of the zodiac, such as 1°08′ Gemini. A planet belongs to the house whose cusp it has most recently passed in zodiac order. Near a cusp, two things can change the answer: a different house system, and an error in the birth time, because every cusp moves with the time. Astrologers also differ over how to read a planet just before a cusp.

Calculated: the cusps turn with the sky, so a small error in the birth time moves all twelve. In the example chart the Ascendant was at 24°15′ Aries at noon and had reached 26°26′ Aries by 12:04. A planet a degree or two from a cusp can change house with an error of a few minutes; one in the middle of a large house is far less sensitive.

On your OrbHeaven chart: each planet is placed strictly by the cusps, and the House cusps list shows where every line falls, so you can see how close a planet is to the next one.

What do the 1st to 6th houses mean?

In the tradition, the first six houses are read as the personal and private side of life: the self, possessions, the near world, home, pleasure and daily work. Geometrically, under Placidus they are the six houses below the horizon at the moment of birth, running from the Ascendant down through the IC to the Descendant. Reading below the horizon as private is the tradition’s; the geometry says only where the houses are.

1st house

Read as you: body, appearance, the way you begin things and meet the world. Under Placidus it begins at the Ascendant, just below the eastern horizon.

2nd house

Read as what you own and value: money, possessions, self-worth. The tradition reads a planet here through what is earned, kept and spent.

3rd house

Read as the near world: siblings, neighbours, short trips, talking, learning, writing. The tradition reads a planet here through everyday exchange with the people close by.

4th house

Read as home, family, roots, the private self, and one parent. Under Placidus it begins at the IC, opposite the Midheaven.

5th house

Read as pleasure, play, creativity, romance, children. The tradition reads a planet here through what is done for its own sake.

6th house

Read as work as daily routine, health, service, the body maintained. The tradition reads a planet here through habits, duties and upkeep.

What do the 7th to 12th houses mean?

In the tradition, the last six houses are read as life turned outward: partnership, what is shared, the wider world, public standing, friends, and what is hidden. Under Placidus they are the six houses above the horizon at the moment of birth, running from the Descendant up through the Midheaven to the Ascendant. Each sits opposite one of the first six, and the tradition reads the pairs together: self and partner, home and career.

7th house

Read as partnership: marriage, close one-to-one bonds, open enemies. Under Placidus it begins at the Descendant, opposite the 1st.

8th house

Read as what is shared and what is lost: other people’s money, intimacy, death, transformation. The tradition reads a planet here through bonds and obligations to other people.

9th house

Read as the far world: travel, higher study, belief, publishing, the law. The tradition reads a planet here through whatever widens the view beyond the familiar.

10th house

Read as career, reputation, public standing, and the other parent. Under Placidus it begins at the Midheaven, where the zodiac crosses the meridian.

11th house

Read as friends, groups, causes, and hopes for the future. The tradition reads a planet here through the company a person keeps.

12th house

Read as the hidden: solitude, sleep, secrets, sacrifice, what is behind you. The tradition reads a planet here through retreat and what is out of sight.

Does an empty house mean anything?

Not what it sounds like. There are ten planets, counting the Sun and Moon, and twelve houses, so every chart has at least two houses with no planet in them, and most have several. The tradition does not read an empty house as an empty area of life. It reads it as an area where nothing in the chart is pressing especially. The house is still there, with its own cusp and its own sign.

Calculated: the example chart’s ten planets sit in only seven houses; the 2nd to the 6th hold none.

What can a chart show without a birth time?

Most of it, but not the houses. Without a time, each planet’s sign is still known, unless the planet changed sign that day, and so is its approximate degree. Many aspects can be known for certain. What cannot be known is anything set by the horizon: the Ascendant, the Midheaven and the houses, and with them the rising sign and the chart ruler. The planets are not wrong without a time; the houses are simply missing.

Calculated: the houses turn through the whole sky in about a day, so a birth date alone cannot place them. On 1 January 2000 at Greenwich the Sun passed through all twelve houses while staying in Capricorn the whole day.

On your OrbHeaven chart: tick “I do not know my birth time” and the chart is worked out across the whole birth date: ranges in whole degrees, both signs where a planet changed sign, aspects marked certain or possible, and no Ascendant, Midheaven or houses. Nothing is guessed. See without a birth time.