Western Solar Arc Directions

Solar Arc Directions for a target date. The solar arc (progressed Sun - natal Sun) is applied uniformly to every natal planet and angle. Unlike secondary progressions, all planets advance at the same rate (~1° per year). Returns directed positions for all 10 planets plus directed MC and ASC.

Endpoint

POST /v1/western/progressions/solar-arc

Request parameters

Field	Type	Required	Description
location	string | null	No	City name to resolve to lat/lon/tz automatically. Example: 'Mumbai' or 'New Delhi, India'. If provided, latitude, longitude and timezone are not required.
name	string	No	Person name associated with the birth record
date	string	Yes	Birth date in YYYY-MM-DD format
time	string | null	No	Birth time in HH:MM 24-hour format. If omitted, sunrise chart is used as fallback.
latitude	number | null	No	Latitude. Required if location not provided.
longitude	number | null	No	Longitude. Required if location not provided.
timezone	string | null	No	IANA timezone. Required if location not provided.
ayanamsa	string	No	Sidereal ayanamsa mode used in calculations
target_date	string | null	No	Target date for progressions YYYY-MM-DD. Defaults to today.

Example request

curl

curl -X POST "https://api.asterwise.com/v1/western/progressions/solar-arc" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"name":"Arjun Mehta","date":"1985-11-12","time":"06:45","latitude":19.076,"longitude":72.8777,"timezone":"Asia/Kolkata","target_date":"2026-01-01"}'

Python

import asterwise
from asterwise.api.western_astrology_api import WesternAstrologyApi
from asterwise.models.progression_request import ProgressionRequest

configuration = asterwise.Configuration(
    host="https://api.asterwise.com",
    access_token="YOUR_API_KEY",
)

request = ProgressionRequest(
    name="Arjun Mehta",
    date="1985-11-12",
    time="06:45",
    latitude=19.076,
    longitude=72.8777,
    timezone="Asia/Kolkata",
    target_date="2026-01-01",
)

with asterwise.ApiClient(configuration) as client:
    api = WesternAstrologyApi(client)
    result = api.western_progressions_solar_arc(progression_request=request)
    print(result)

TypeScript

import { createClient, createConfig, westernProgressionsSolarArc } from 'asterwise';

const client = createClient(createConfig({
  baseUrl: 'https://api.asterwise.com',
  headers: { Authorization: 'Bearer YOUR_API_KEY' },
}));

const result = await westernProgressionsSolarArc({
  client,
  body: {
      "name": "Arjun Mehta",
      "date": "1985-11-12",
      "time": "06:45",
      "latitude": 19.076,
      "longitude": 72.8777,
      "timezone": "Asia/Kolkata",
      "target_date": "2026-01-01"
  },
});

console.log(result.data);

Example response

{
  "success": true,
  "message": "success",
  "data": {
    "target_date": "2026-01-01",
    "solar_arc": 40.677288,
    "age_years": 40.139,
    "natal_sun_longitude": 229.596712,
    "progressed_sun_longitude": 270.274,
    "directed_planets": [
      {
        "name": "Sun",
        "natal_longitude": 229.596712,
        "directed_longitude": 270.274,
        "sign": "Capricorn",
        "sign_index": 9,
        "degree_in_sign": 0.274,
        "dignity": "peregrine",
        "dignity_score": 0
      },
      {
        "name": "Moon",
        "natal_longitude": 221.838294,
        "directed_longitude": 262.515582,
        "sign": "Sagittarius",
        "sign_index": 8,
        "degree_in_sign": 22.515582,
        "dignity": "peregrine",
        "dignity_score": 0
      },
      "... and 8 more items"
    ],
    "directed_ascendant": 269.63497,
    "directed_ascendant_sign": "Sagittarius",
    "directed_mc": 181.020539,
    "directed_mc_sign": "Libra"
  }
}

Response fields

Field	Type	Description
success	boolean	True if the request succeeded
message	string	Human-readable status message
data	object
data.target_date	string
data.solar_arc	number	Solar arc in degrees applied to all planets
data.age_years	number
data.natal_sun_longitude	number
data.progressed_sun_longitude	number
data.directed_planets	array[object]
data.directed_planets[].name	string
data.directed_planets[].natal_longitude	number
data.directed_planets[].directed_longitude	number
data.directed_planets[].sign	string
data.directed_planets[].sign_index	integer
data.directed_planets[].degree_in_sign	number
data.directed_planets[].dignity	string
data.directed_planets[].dignity_score	integer
data.directed_ascendant	number
data.directed_ascendant_sign	string
data.directed_mc	number
data.directed_mc_sign	string

Errors

Code	Description	Reference
authentication_failed	Missing or invalid API key.	authentication_failed
ephemeris_unavailable	Upstream ephemeris service error.	ephemeris_unavailable
insufficient_tier	API key tier does not include this endpoint.	insufficient_tier
internal_error	Unexpected server error.	internal_error
ip_rate_limit_exceeded	Too many requests in a short window.	ip_rate_limit_exceeded
payload_too_large	Request body exceeds the size limit.	payload_too_large
resource_not_found	Referenced resource was not found.	resource_not_found
validation_error	Request body failed schema validation.	validation_error

Related endpoints

• Western Secondary Progressions