Date
Locates the planets within the tropical zodiac.
THE CHART'S LOCAL HORIZON
The houses describe where life happens. Time and place create them.
Houses divide the local sky into twelve areas of experience. Unlike a planet's tropical sign, a house placement depends on the birth moment, coordinates, and a selected house system.
THREE PIECES OF LOCAL CONTEXT
A house chart belongs to one moment and one horizon.
Date alone cannot reconstruct the sky's orientation for a birthplace. These inputs work together.
Time
Sets the rotating angles and time-dependent cusps.
Place
Provides latitude, longitude, and historical timezone.
House system
Defines the method used to divide the local sky.
TWELVE AREAS OF EXPERIENCE
A map of life contexts, not twelve personality types.
A planet in a house describes where that planet's function tends to become concrete. The house does not replace the planet or its sign.
SELF + APPROACH
First House
Embodied presence, first approach, personal agency, appearance, and the way a person meets immediate life.
RESOURCES + VALUES
Second House
Money, possessions, personal resources, self-support, priorities, and what is treated as worth preserving.
LEARNING + EXCHANGE
Third House
Everyday learning, speech, writing, siblings, short journeys, and the immediate information environment.
HOME + ROOTS
Fourth House
Private foundations, home, family history, belonging, ancestry, and the inner base beneath public life.
CREATIVITY + PLAY
Fifth House
Creative expression, pleasure, romance, play, risk, performance, and relationships with children.
ROUTINE + CARE
Sixth House
Daily work, skills, service, maintenance, routines, health habits, and attention to practical systems.
PARTNERSHIP + AGREEMENT
Seventh House
One-to-one partnership, contracts, collaboration, open conflict, and the qualities encountered through others.
SHARING + CHANGE
Eighth House
Shared resources, debt, inheritance, trust, intimacy, vulnerability, loss, and psychologically consequential change.
MEANING + PERSPECTIVE
Ninth House
Higher learning, worldview, publishing, law, religion, long journeys, and experiences that widen perspective.
PUBLIC ROLE + DIRECTION
Tenth House
Career, public contribution, reputation, authority, responsibility, and the direction of visible achievement.
GROUPS + FUTURES
Eleventh House
Friendship, communities, networks, collective causes, audiences, hopes, and participation in a larger future.
RETREAT + CLOSURE
Twelfth House
Solitude, restoration, hidden processes, endings, surrender, and material that works outside ordinary awareness.
HOUSE SYSTEMS IN SELYUNE
Placidus by default, with a documented fallback.
Selyune stores the house system with every calculation. A result never silently mixes methods.
Calculate the angles
Ascendant, Descendant, Midheaven, and IC are derived from the instant and coordinates.
Solve Placidus cusps
The default system divides the diurnal motion using astronomical semi-arc geometry.
Protect high-latitude charts
Where Placidus cusps are undefined or unreliable, Selyune uses Whole Sign houses and records a warning.
Place each body
Planetary longitudes are assigned to the calculated cusps or to Whole Sign houses when that system applies.
TIME-SENSITIVE BY DESIGN
House certainty follows birth-time certainty.
A few minutes can move an angle or cusp. Selyune preserves the stated time accuracy instead of presenting every chart as equally exact.
When time is reliable
- Ascendant, Descendant, Midheaven, and IC
- Placidus cusps or a recorded Whole Sign fallback
- Planet and transit house placements
- Angular-house context in deterministic relevance
When time is approximate or unknown
- Approximate time produces an explicit uncertainty warning
- Unknown time produces no angles or houses
- No invented noon Ascendant or house placement
- No time-dependent claim disguised as certainty
ADD THE LOCAL SKY
Use a recorded birth time to calculate your houses.
If you do not know the time, you can still calculate a limited chart and add it later.