Western Synastry

Aspect grid between two natal charts using the tropical zodiac. Returns all inter-chart aspects using standard modern Western orbs. Useful for relationship compatibility analysis.

Endpoint

POST /v1/western/synastry

Request parameters

Field	Type	Required	Description
person1	object	Yes
person1.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.
person1.name	string	No	Person name associated with the birth record
person1.date	string	Yes	Birth date in YYYY-MM-DD format
person1.time	string \| null	No	Birth time in HH:MM 24-hour format. If omitted, sunrise chart is used as fallback.
person1.latitude	number \| null	No	Latitude. Required if location not provided.
person1.longitude	number \| null	No	Longitude. Required if location not provided.
person1.timezone	string \| null	No	IANA timezone. Required if location not provided.
person1.ayanamsa	string	No	Sidereal ayanamsa mode used in calculations
person2	object	Yes
person2.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.
person2.name	string	No	Person name associated with the birth record
person2.date	string	Yes	Birth date in YYYY-MM-DD format
person2.time	string \| null	No	Birth time in HH:MM 24-hour format. If omitted, sunrise chart is used as fallback.
person2.latitude	number \| null	No	Latitude. Required if location not provided.
person2.longitude	number \| null	No	Longitude. Required if location not provided.
person2.timezone	string \| null	No	IANA timezone. Required if location not provided.
person2.ayanamsa	string	No	Sidereal ayanamsa mode used in calculations

Example request

curl
Python
TypeScript

curl -X POST "https://api.asterwise.com/v1/western/synastry" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"person1":{"name":"Arjun Mehta","date":"1985-11-12","time":"06:45","latitude":19.076,"longitude":72.8777,"timezone":"Asia/Kolkata"},"person2":{"name":"Sofia Shah","date":"1988-03-24","time":"14:30","latitude":28.6139,"longitude":77.209,"timezone":"Asia/Kolkata"}}'

import asterwise
from asterwise.api.western_astrology_api import WesternAstrologyApi
from asterwise.models.two_person_request import TwoPersonRequest

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

request = TwoPersonRequest(
    person1={'name': 'Arjun Mehta', 'date': '1985-11-12', 'time': '06:45', 'latitude': 19.076, 'longitude': 72.8777, 'timezone': 'Asia/Kolkata'},
    person2={'name': 'Sofia Shah', 'date': '1988-03-24', 'time': '14:30', 'latitude': 28.6139, 'longitude': 77.209, 'timezone': 'Asia/Kolkata'},
)

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

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

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

const result = await westernSynastry({
  client,
  body: {
      "person1": {
        "name": "Arjun Mehta",
        "date": "1985-11-12",
        "time": "06:45",
        "latitude": 19.076,
        "longitude": 72.8777,
        "timezone": "Asia/Kolkata"
      },
      "person2": {
        "name": "Sofia Shah",
        "date": "1988-03-24",
        "time": "14:30",
        "latitude": 28.6139,
        "longitude": 77.209,
        "timezone": "Asia/Kolkata"
      }
  },
});

console.log(result.data);

Example response

{
  "success": true,
  "message": "success",
  "data": {
    "aspects": [
      {
        "person1_planet": "Sun",
        "person2_planet": "Sun",
        "type": "sesquiquadrate",
        "exact_angle": 134.3467,
        "orb": 0.6533
      },
      {
        "person1_planet": "Sun",
        "person2_planet": "Venus",
        "type": "opposition",
        "exact_angle": 179.9187,
        "orb": 0.0813
      },
      "... and 23 more items"
    ],
    "total_aspects": 25
  }
}

Response fields

Field	Type	Description
success	boolean	True if the request succeeded
message	string	Human-readable status message
data	object
data.aspects	array[object]
data.aspects[].person1_planet	string
data.aspects[].person2_planet	string
data.aspects[].type	string
data.aspects[].exact_angle	number
data.aspects[].orb	number
data.total_aspects	integer

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

Endpoint​

Request parameters​

Example request​

Example response​

Response fields​

Errors​

Related endpoints​