Progressed Charts
Calculate secondary progressed charts using various progression methods.
Overview
Progressed charts show the symbolic evolution of a natal chart over time. The most common method is secondary progressions, where one day after birth equals one year of life.
POST /ephemeris/progressed
Calculate a secondary progressed chart.
Request Body
{
subject: {
name: string;
birth_datetime: { iso: string };
birth_location: {
latitude: { decimal: number };
longitude: { decimal: number };
timezone: { iana_name: string };
};
};
progressed_datetime: { iso: string }; // Target date for progressions
configuration?: {
house_system?: "P" | "K" | "W" | "E" | "C" | "R";
progression_method?: "secondary" | "tertiary" | "minor";
};
}
Progression Methods
| Method | Rate | Description |
|--------|------|-------------|
| secondary | 1 day = 1 year | Most common method (default) |
| tertiary | 1 lunar month = 1 year | Moon-based progressions |
| minor | 1 lunar month = 1 month | Faster-moving progressions |
Response
{
success: true;
data: {
natal_chart: ChartInfo;
progressed_chart: ChartInfo;
progressed_planets: {
sun: PlanetPosition;
moon: PlanetPosition;
// ... progressed positions
};
progressed_houses: Record<string, HouseInfo>;
aspects_to_natal: Aspect[]; // Progressed to natal aspects
metadata: {
birth_date: string;
progressed_date: string;
progression_method: string;
age_at_progression: number;
};
};
}
Example Request
curl -X POST https://api.astromcp.io/ephemeris/progressed \
-H "Authorization: Bearer YOUR_JWT_TOKEN" \
-H "Content-Type: application/json" \
-d '{
"subject": {
"name": "Example Person",
"birth_datetime": { "iso": "1990-06-15T14:30:00" },
"birth_location": {
"latitude": { "decimal": 40.7128 },
"longitude": { "decimal": -74.0060 },
"timezone": { "iana_name": "America/New_York" }
}
},
"progressed_datetime": { "iso": "2024-12-08T00:00:00" }
}'
Understanding Progressions
Secondary Progressions: The position of planets 34 days after birth (for someone aged 34) represents their progressed chart at age 34.
Key Progressed Points:
- Progressed Sun: Moves ~1° per year, changes sign every ~30 years
- Progressed Moon: Moves ~12° per year, completes zodiac in ~27 years
- Progressed Ascendant: Changes slowly, about 1° per year
Use Cases
- Current life themes: See where you are in your personal evolution
- Timing: Identify significant periods (progressed Moon aspects)
- Long-term development: Track slow-moving progressed planets
- Life stages: Progressed Sun sign changes mark major life chapters
Related Endpoints
- Natal Charts - Original birth chart
- Transits - Current planetary positions
- Solar Returns - Annual return charts