Planet
What psychological or life function is active.
THE ACTORS IN A BIRTH CHART
The planets describe what is acting. Signs show how.
In Western tropical astrology, each planet represents a distinct function: identity, emotion, language, desire, growth, limits, or change. Its sign, house, and aspects add the context.
A FOUR-PART SENTENCE
One placement carries more than one layer of meaning.
These layers answer different questions. Keeping them separate prevents a sign stereotype from replacing the chart.
Sign
The style and strategy through which it operates.
House
The life area where it becomes most visible.
Aspects
How it coordinates or conflicts with other functions.
CALCULATED POINTS
What Selyune places in the chart.
Selyune calculates ten geocentric bodies plus the mean lunar nodes. The nodes are mathematical points, not physical planets, and are labeled as such.
IDENTITY + VITALITY
Sun
The organizing center of the chart: purpose, visibility, will, and the qualities a person learns to embody deliberately.
EMOTION + INSTINCT
Moon
Automatic reactions, emotional regulation, familiarity, care, and what tends to create a sense of safety.
Its degree and sometimes its sign can depend on birth time, so Selyune marks uncertainty instead of guessing.MIND + LANGUAGE
Mercury
How information is noticed, organized, explained, questioned, and exchanged.
VALUES + ATTRACTION
Venus
Relating, pleasure, affection, taste, reciprocity, and what feels worth choosing or sustaining.
ACTION + DESIRE
Mars
Initiative, pursuit, assertion, anger, libido, conflict style, and the way momentum is created.
GROWTH + MEANING
Jupiter
Expansion, confidence, opportunity, belief, perspective, and where experience is made larger.
LIMITS + MASTERY
Saturn
Responsibility, boundaries, time, consequence, endurance, and the work through which competence develops.
CHANGE + FREEDOM
Uranus
Independence, disruption, innovation, divergence, and the pressure to break an outdated pattern.
IMAGINATION + IDEALS
Neptune
Sensitivity, imagination, ideals, surrender, permeability, and places where clarity requires care.
POWER + TRANSFORMATION
Pluto
Intensity, compulsion, power, elimination, regeneration, and long processes of irreversible change.
MEAN LUNAR NODE
North Node
A calculated intersection point often interpreted as an unfamiliar developmental direction or stretch.
OPPOSITE LUNAR NODE
South Node
The point exactly opposite the North Node, often associated with practiced responses and familiar territory.
FROM POSITION TO INTERPRETATION
A placement is calculated before it is described.
The narrative layer receives structured facts. It never chooses a planet's longitude, house, retrograde state, or aspects.
Locate the body
The astronomy engine calculates a geocentric ecliptic longitude for the recorded instant.
Normalize the position
Longitude becomes a tropical sign, degree, minute, speed, and retrograde state.
Add chart context
When time is reliable, Selyune adds houses and angles, then calculates major aspects.
Interpret only those facts
Explanatory language is constrained to the calculated evidence and its recorded uncertainty.
SUPPORTED SCOPE
Clear about what is and is not in the chart.
Selyune documents the calculation set so an interpretation cannot quietly introduce a body or technique the engine did not produce.
Calculated and versioned
- Sun through Pluto in the tropical zodiac
- Mean North and South lunar nodes
- Longitude speed and retrograde state
- Major natal, transit, and synastry aspects
Not claimed by Selyune
- Chiron or additional asteroids
- Sidereal or Vedic zodiac calculations
- A certain Moon sign when the date crosses a sign boundary
- Scientific prediction or guaranteed outcomes
SEE THE PLACEMENTS TOGETHER
Calculate the chart before reading one planet in isolation.
Your free result begins with the complete set of supported placements and transparent limits.