Secondary progressions calculator - progressed chart, progressed Sun and Moon
post_astrology_progressionsRead-only
Generate the secondary progressed chart for any date using the day-for-a-year key. Each day of ephemeris motion after birth stands in for one year of life. Returns every progressed body with its sign, degree, natal house, motion, and retrograde state, plus the progressed Ascendant and Midheaven via the Naibod arc. The progressed Sun and progressed Moon are the headline timing markers for inner growth and emotional chapters. Secondary progressions API, progressed chart calculator, progressed Sun and Moon, progressed Ascendant and Midheaven.
Example tool call
This call uses example arguments supplied in the tool’s input schema.
{
"id": 1,
"jsonrpc": "2.0",
"method": "tools/call",
"params": {
"arguments": {
"date": "1990-07-15",
"time": "14:30:00",
"latitude": 40.7128,
"timezone": "America/New_York",
"longitude": -74.006,
"targetDate": "2025-07-15"
},
"name": "post_astrology_progressions"
}
}Input Schema
| Name | Required | Description | Default |
|---|---|---|---|
| date | Yes | Birth date in YYYY-MM-DD format. Determines planetary positions for the specific calendar day. | |
| lang | No | Response language (BCP 47). Supported: en, tr, de, es, hi, pt, fr, ru, zh-Hans, zh-Hant. Defaults to en. Coverage varies by domain, and a field with no translation in the requested language returns English. | en |
| time | Yes | Birth time in 24-hour HH:MM:SS format. Determines the Ascendant (rising sign) and house cusps. Use 12:00:00 if unknown. | |
| compact | No | Set true for the same data in a compact shape: arrays of same-shaped objects arrive columnar as {"__cols":[names],"__rows":[[values]]}. Lossless, typically 40 to 52 percent fewer tokens. | |
| latitude | Yes | Birth location latitude in decimal degrees (-90 to 90). Positive = North, negative = South. | |
| nodeType | No | Lunar node convention. "mean" is the smoothed average node, which always moves retrograde; "true" is the osculating node, which tracks the real perturbed node, oscillates up to about 1.5 degrees either side of the mean on a 173-day cycle, and can briefly turn direct. Neither is more correct and they almost always fall in the same sign. Applies to the North and South Node. True is the osculating node and the default, because it is what most Western chart software reports; mean is the smoothed node preferred by several evolutionary schools, so pass "mean" to match one. Nothing else in the chart changes, and the two agree on the sign except when the node sits within about 1.8 degrees of a cusp. Defaults to "true". | true |
| timezone | Yes | Timezone: an IANA name (e.g. "America/New_York", "Europe/London", or `cities[0].timezone` from /location/search) or decimal hours from UTC (e.g. -5 for EST, 5.5 for IST). An IANA name is resolved to the offset in force at the given date and time. | |
| longitude | Yes | Birth location longitude in decimal degrees (-180 to 180). Positive = East, negative = West. | |
| targetDate | Yes | Date to progress the chart to, in YYYY-MM-DD format. Usually today or a forecast date. The day-for-a-year key turns the elapsed years since birth into the same number of ephemeris days after the birth moment. | |
| houseSystem | No | House system of the natal chart that every progressed body is placed in. Pass the system the natal chart was drawn in so the house numbers match it. Placidus (default) is the most widely used in Western astrology. Whole Sign assigns one sign per house. Equal divides into 30 degree segments from the Ascendant. Koch emphasizes higher latitudes. Quadrant systems fall back to Whole Sign above the polar circle. | placidus |
Output Schema
| Name | Required | Description | Default |
|---|---|---|---|
| planets | Yes | ||
| summary | Yes | ||
| ascendant | Yes | ||
| midheaven | Yes | ||
| targetDate | Yes | ||
| birthDetails | Yes | ||
| elapsedYears | Yes | ||
| progressedDate | Yes |