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Natal Chart (Tropical) · House 1 of 12

The first house, which begins at the rising degree

The first house is the house that begins at the Ascendant, the degree rising in the east. Lilly ranks it the strongest of the twelve and gives it the person born; modern astrology reads it as the self, the manner and the way a person begins things.

Which of your planets sit in this house?

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A wheel of twelve equal houses numbered counter-clockwise from the Ascendant at the left, with the horizon and the meridian drawn; house 1 is filled, labelled angular. 1 2 3 4 5 6 7 8 9 10 11 12 AC DC MC IC Angular
The first house in a schematic wheel of twelve equal houses; real cusps vary with the house system and the latitude. Our drawing.

Facts

Class
Angular
Lilly's ranking of strength
First of twelve
Its cusp
The Ascendant (AC), in every quadrant system
Side of the horizon
Below the horizon (night side); the first quadrant, from the Ascendant to the IC
In whole-sign houses
The rising sign itself
Natural sign (modern teaching)
Aries, with Mars
Our keywords
"self, appearance, approach"

Meaning

Every house is counted from the first, and the first is counted from the horizon: it begins at the Ascendant, the point of the zodiac rising in the east at the birth moment. In whole-sign houses it is the whole rising sign, with the Ascendant's degree somewhere inside it.

Lilly in 1647 gives the first house the life of the person born, their stature, colour and form, and the head and face; it is the first of his four angles and the first in his ranking of strength. The tradition since has read it as the body, the manner and the way a person starts things and meets the world. Our keywords are "self, appearance, approach".

In a chart

The sign on the first house is the rising sign, and its ruler is the chart ruler, read first after the big three. A planet in the first house, close to the Ascendant, is read as colouring the whole manner of the person. A planet in the rising sign but a few degrees above the Ascendant is in the first house by whole signs and in the twelfth by Placidus, which is why our chart names its house system.

The first house lies below the horizon, at the start of the quadrant that runs down from the Ascendant to the IC. Modern teaching pairs it with Aries and Mars, a scheme Alan Leo taught in the early twentieth century; Lilly's own pairings were different, Aries and Saturn for this house.

Across the traditions

In the Hellenistic texts the twelve places were counted by whole signs from the rising sign, and Valens's first place is simply the hour-marker's sign. Jyotisha keeps that rule: its first bhava is the whole sign of the lagna. Quadrant systems, Placidus among them, came later; whichever is used, the first house always starts at or contains the Ascendant.

Correspondences

Each item with how it stands: “sourced” is in the work cited, “our construction” is EsoTerrier’s own, and “disputed” means the sources disagree.

Topics (Lilly, 1647)
The life, stature, colour and form of the person; the head and face sourced
Class (Lilly)
Angular, first in strength sourced
Natural sign and ruler
Aries, with Mars: a modern teaching device after Alan Leo; Lilly's pairings differ sourced
Topics (modern)
Self, appearance, approach sourced
One right house system
No: a planet's house can change with the system; ours is named on the chart disputed
Our keywords
"self, appearance, approach" our construction

How the schools read it

Hellenistic (Valens)
The first place, counted by whole signs from the rising sign.
Lilly (1647)
Angular; the life, stature, colour and form of the person; the head and face.
Modern psychological (Alan Leo, Rudhyar and after)
Self, appearance, approach.
Jyotisha
The first bhava, always counted by whole signs from the lagna.
EsoTerrier
Placidus by default, Whole Sign and Equal a tap away, Porphyry above the polar circles; a reading for each planet in the house, in our own words.

Claims about it

  • There is one correct house system, and a planet's house is a fact of the sky.

    disputed

    What the record shows: A planet's house depends on the division chosen: between Placidus and Whole Sign a median of twelve of sixteen objects changed house in our 56 test charts. We default to Placidus and show the system on the chart.

  • Placidus is the traditional, or the original, house system.

    false

    What the record shows: The Hellenistic tradition used whole-sign houses. The Placidus division was first published by Magini in 1602; it is the most used today, not the oldest.

Elsewhere on EsoTerrier

Sources

Primary texts (3)
  1. Vettius Valens; tr. Mark T. Riley, Vettius Valens, Anthologies, translated by Mark T. Riley (preliminary translation, released 2010). Skyscript (hosting the author's PDF), 2010. The translator's copyright; facts and chapter references only. skyscript.co.uk/valens_riley.html
  2. William Lilly, Christian Astrology, modestly treated of in three books. Thomas Brudenell for John Partridge and Humphrey Blunden, London, 1647. Public domain; quoted briefly, from the 1647 edition. archive.org/details/b30338724
  3. Alan Leo (William Frederick Allan), Astrology for All, to which is added a complete system of predictive astrology for advanced students. Modern Astrology Office, London, 1899. Public domain; quoted briefly. archive.org/details/bub_gb_8CwSAAAAYAAJ
Studies and other sources (1)
  1. Wikipedia contributors, Wikipedia: House (astrology). 2026. CC BY-SA; consulted for facts. en.wikipedia.org/wiki/House_(astrology)
Our own research (4)
  1. EsoTerrier, Natal and sidereal wheels: research for the rebuild (README, report-main.md, notes/). Research folder 2026-10-11-natal-sidereal, 2026.
  2. EsoTerrier, Helper report: validation of the natal chart engine (tropical and sidereal). Validation report, 2026-10-11, 2026.
  3. EsoTerrier, EsoTerrier chart engine: services/chart/ephemeris.py, calculation.py, jyotish.py, texts.py. python/esoterrier, services/chart, 2026.
  4. EsoTerrier, EsoTerrier app: resources/js/support/natal.ts and components/Chart/NatalChartTropical.vue. The chart component in our app, 2026.

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By EsoTerrier. Written with AI assistance from our research and checked against its sources; last revised 20 October 2026. How we write these pages.

First published ; last revised . Corrections: support@esoterrier.com.