When To Use It

Use quaternary when you want a progression system that moves faster than secondary and is intentionally tuned for compressed symbolic timing.

How It Differs From Secondary

Like secondary, quaternary gives you a chart for a target date. The difference is the symbolic timing rule, which produces denser event movement inside shorter forward windows.

Minimal Request

curl -X POST "https://api.freeastroapi.com/api/v1/western/progressions/quaternary" \
 -H "Content-Type: application/json" \
 -H "x-api-key: YOUR_API_KEY" \
 -d '{
  "natal": {
    "name": "User",
    "datetime": "1990-01-01 12:00",
    "time_known": true,
    "location": {
      "city": "London",
      "lat": 51.5074,
      "lng": -0.1278,
      "tz_str": "AUTO"
    }
  },
  "quaternary_progression": {
    "target_date": "2026-03-30"
  }
}'

Table Mode

curl -X POST "https://api.freeastroapi.com/api/v1/western/progressions/quaternary?response_mode=table" \
 -H "Content-Type: application/json" \
 -H "x-api-key: YOUR_API_KEY" \
 -d '{
  "natal": {
    "name": "User",
    "datetime": "1990-01-01 12:00",
    "time_known": true,
    "location": {
      "city": "London",
      "lat": 51.5074,
      "lng": -0.1278,
      "tz_str": "AUTO"
    }
  },
  "quaternary_progression": {
    "target_date": "2026-03-30"
  }
}'

Real API Response Example

Captured from the live API on April 14, 2026 using the minimal request above.

{
  "meta": {
    "endpoint": "progressions_chart",
    "version": "v1",
    "system": "quaternary",
    "zodiac_type": "tropical",
    "house_system": "placidus",
    "calculation_method": "quaternary_progressions_lunar_month_for_year",
    "target_date": "2026-03-30",
    "target_datetime": "2026-03-30T00:00:00Z",
    "orb_deg": 1,
    "generated_at": "2026-04-14T15:54:53Z"
  },
  "progression_basis": {
    "age_years_decimal": 36.240337,
    "progressed_days_after_birth": 1070.198491,
    "natal_datetime_utc": "1990-01-01T12:00:00Z",
    "progressed_datetime_utc": "1992-12-06T16:45:49Z"
  },
  "progressed_chart": {
    "points": {
      "sun": {
        "name": "Sun",
        "longitude_deg": 254.831966,
        "longitude_text": "14°50' Sag",
        "latitude_deg": 0.0001,
        "distance_au": 0.985155,
        "sign": {
          "name": "Sagittarius",
          "index": 8,
          "abbr": "Sag"
        },
        "position_in_sign_deg": 14.831966,
        "house": 6,
        "retrograde": false
      },
      "moon": {
        "name": "Moon",
        "longitude_deg": 34.491796,
        "longitude_text": "04°30' Tau",
        "latitude_deg": 3.868999,
        "distance_au": 0.002612,
        "sign": {
          "name": "Taurus",
          "index": 1,
          "abbr": "Tau"
        },
        "position_in_sign_deg": 4.491796,
        "house": 11,
        "retrograde": false
      },
      "mercury": {
        "name": "Mercury",
        "longitude_deg": 234.428285,
        "longitude_text": "24°26' Sco",
        "latitude_deg": 2.535847,
        "distance_au": 0.942754,
        "sign": {
          "name": "Scorpio",
          "index": 7,
          "abbr": "Sco"
        },
        "position_in_sign_deg": 24.428285,
        "house": 6,
        "retrograde": false
      }
    },
    "angles": {
      "ascendant": {
        "longitude_deg": 90.079,
        "longitude_text": "00°05' Can",
        "sign": {
          "name": "Cancer",
          "index": 3,
          "abbr": "Can"
        },
        "position_in_sign_deg": 0.079
      },
      "midheaven": {
        "longitude_deg": 324.758,
        "longitude_text": "24°45' Aqu",
        "sign": {
          "name": "Aquarius",
          "index": 10,
          "abbr": "Aqu"
        },
        "position_in_sign_deg": 24.758
      }
    }
  },
  "aspects": {
    "progressed_to_natal": [
      {
        "id": "p_jupiter_square_n_sun",
        "aspect": {
          "name": "square",
          "angle_deg": 90
        },
        "progressed_point": "jupiter",
        "natal_point": "sun",
        "orb_deg": 0.255,
        "separation_deg": 90.255,
        "applying": true,
        "exact": false,
        "exact_date": "2026-04-21T05:54:22Z",
        "polarity": "hard",
        "strength": 0.879,
        "category": "major",
        "interpretation_key": "progressed_jupiter_square_natal_sun"
      },
      {
        "id": "p_uranus_conjunction_n_saturn",
        "aspect": {
          "name": "conjunction",
          "angle_deg": 0
        },
        "progressed_point": "uranus",
        "natal_point": "saturn",
        "orb_deg": 0.578,
        "separation_deg": 0.578,
        "applying": false,
        "exact": false,
        "exact_date": "2025-11-10T00:00:00Z",
        "polarity": "neutral",
        "strength": 0.422,
        "category": "major",
        "interpretation_key": "progressed_uranus_conjunction_natal_saturn"
      },
      {
        "id": "p_neptune_sextile_n_pluto",
        "aspect": {
          "name": "sextile",
          "angle_deg": 60
        },
        "progressed_point": "neptune",
        "natal_point": "pluto",
        "orb_deg": 0.356,
        "separation_deg": 60.356,
        "applying": false,
        "exact": false,
        "exact_date": "2025-11-09T01:30:00Z",
        "polarity": "soft",
        "strength": 0.644,
        "category": "major",
        "interpretation_key": "progressed_neptune_sextile_natal_pluto"
      }
    ],
    "progressed_to_progressed": [
      {
        "id": "p_saturn_sextile_p_sun",
        "aspect": {
          "name": "sextile",
          "angle_deg": 60
        },
        "point_1": "saturn",
        "point_2": "sun",
        "orb_deg": 0.846,
        "separation_deg": 59.154,
        "applying": true,
        "exact": false,
        "exact_date": "2026-03-18T19:38:26Z",
        "polarity": "soft",
        "strength": 0.182,
        "category": "major",
        "interpretation_key": "progressed_saturn_sextile_progressed_sun"
      },
      {
        "id": "p_mercury_conjunction_p_pluto",
        "aspect": {
          "name": "conjunction",
          "angle_deg": 0
        },
        "point_1": "mercury",
        "point_2": "pluto",
        "orb_deg": 0.702,
        "separation_deg": 0.702,
        "applying": false,
        "exact": false,
        "exact_date": "2025-12-10T00:00:00Z",
        "polarity": "neutral",
        "strength": 0.298,
        "category": "major",
        "interpretation_key": "progressed_mercury_conjunction_progressed_pluto"
      },
      {
        "id": "p_mars_opposition_p_venus",
        "aspect": {
          "name": "opposition",
          "angle_deg": 180
        },
        "point_1": "mars",
        "point_2": "venus",
        "orb_deg": 0.388,
        "separation_deg": 179.612,
        "applying": false,
        "exact": false,
        "exact_date": "2026-03-25T00:00:00Z",
        "polarity": "hard",
        "strength": 0.612,
        "category": "major",
        "interpretation_key": "progressed_mars_opposition_progressed_venus"
      }
    ]
  }
}

Related Utility Pages

Exact ingresses, exact aspects, and calendar are also available for quaternary through the shared utility docs pages.