Chart Patterns

Endpoint POST https://starsapi.com/api/v3/western/natal/chart-patterns

Overview

Detects 7 major geometric aspect patterns in the natal chart. These configurations are formed when specific aspect combinations link three or more planets into a recognizable shape. Pattern detection is one of the most commercially valuable features in Western astrology apps — it gives users immediate insight into the chart’s core dynamics.

Supports custom orbs per aspect type, so users can tighten or widen pattern detection sensitivity.

Authentication

Method	Example
Header (recommended)	`X-Api-Key: am_live_xxxxxxxxxxxx`
Bearer	`Authorization: Bearer am_live_xxxxxxxxxxxx`
Query	`?api_key=am_live_xxxxxxxxxxxx`

Request body

Field	Type	Required	Description
`year`	integer	Yes	Birth year (1800–2400).
`month`	integer	Yes	Birth month (1–12).
`day`	integer	Yes	Birth day.
`hour`	integer	Yes	Birth hour (0–23).
`minute`	integer	Yes	Birth minute (0–59).
`second`	integer	No	Default `0`.
`latitude`	number	Yes	Decimal degrees.
`longitude`	number	Yes	Decimal degrees.
`timezone`	string	Yes	IANA timezone.
`house_system`	string	No	Default `placidus`. Affects stellium-by-house detection.
`node_type`	string	No	`true`, `mean`, or `both`. Default `true`.
`custom_orbs`	object	No	Override default orbs per aspect type (0–15°). See below.

Custom orbs

Same format as natal/aspects custom orbs. Tightening orbs reduces pattern detection sensitivity; widening orbs may reveal additional patterns.

{ "custom_orbs": { "trine": 5, "opposition": 6, "square": 5, "sextile": 4, "quincunx": 2 } }

Response shape

`data.patterns[]`

Array of detected patterns. Each includes:

Field	Type	Description
`pattern`	string	Pattern name.
`planets`	array\|object	Planets involved. For T-Square and Yod, structured with `apex`.
`element`	string	Element (Grand Trine only).
`modality`	string	Modality (T-Square, Grand Cross only).
`apex_planet`	string	Focal planet (T-Square, Yod, Kite).
`type`	string	Stellium type: `sign` or `house`.
`description`	string	Brief interpretation.

`data.summary`

Count per pattern type — useful for quick display (e.g. badges, icons).

Pattern types

Pattern	Planets	Aspects involved	Meaning
Grand Trine	3	3 mutual trines (120°)	Natural talent, ease, flow. Identified by element (Fire/Earth/Air/Water).
T-Square	3	1 opposition + 2 squares	Dynamic tension with focal release through the apex planet.
Grand Cross	4	2 oppositions + 4 squares	Maximum tension from four corners. Immense drive and resilience.
Yod (Finger of God)	3	1 sextile + 2 quincunxes	Fated pattern. The apex planet carries a special mission or crisis.
Kite	4	Grand Trine + opposition + 2 sextiles	Grand Trine given productive direction through the kite point.
Mystic Rectangle	4	2 oppositions + 2 sextiles + 2 trines	Balanced tension with practical outlets.
Stellium	3+	Sign or house cluster	Intense concentration — 3+ planets in one sign or house.

Errors

HTTP	Code	Cause
400	`MISSING_FIELD`	Required field absent.
400	`INVALID_DATE`	Invalid date.
400	`INVALID_TIME`	Time outside range.
400	`INVALID_TIMEZONE`	Not valid IANA.
400	`INVALID_COORDINATE`	Out of range.
400	`INVALID_PARAM`	Invalid `house_system` or `custom_orbs`.
500	`EPHEMERIS_ERROR`	Computation failed.

# Replace YOUR_API_KEY with the key from your dashboard
curl -X POST "https://starsapi.com/api/v3/western/natal/chart-patterns" \
  -H "X-Api-Key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
        "year": 1990,
        "month": 5,
        "day": 20,
        "hour": 14,
        "minute": 30,
        "second": 0,
        "latitude": 28.6139,
        "longitude": 77.209,
        "timezone": "Asia/Kolkata",
        "house_system": "placidus",
        "node_type": "true"
    }'

const response = await fetch(
  'https://starsapi.com/api/v3/western/natal/chart-patterns',
  {
    method: 'POST',
    headers: {
      'X-Api-Key': 'YOUR_API_KEY',
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({
      year: 1990,
      month: 5,
      day: 20,
      hour: 14,
      minute: 30,
      second: 0,
      latitude: 28.6139,
      longitude: 77.209,
      timezone: 'Asia/Kolkata',
      house_system: 'placidus',
      node_type: 'true'
    })
  }
);
const result = await response.json();

if (result.success) {
  console.log(result.data);
}

import requests
import os

response = requests.post(
    'https://starsapi.com/api/v3/western/natal/chart-patterns',
    headers={'X-Api-Key': os.environ['STARSAPI_KEY']},
    json={
        'year': 1990,
        'month': 5,
        'day': 20,
        'hour': 14,
        'minute': 30,
        'second': 0,
        'latitude': 28.6139,
        'longitude': 77.209,
        'timezone': 'Asia/Kolkata',
        'house_system': 'placidus',
        'node_type': 'true'
    }
)
result = response.json()

if result['success']:
    print(result['data'])

<?php
$payload = [
    'year' => 1990,
    'month' => 5,
    'day' => 20,
    'hour' => 14,
    'minute' => 30,
    'second' => 0,
    'latitude' => 28.6139,
    'longitude' => 77.209,
    'timezone' => 'Asia/Kolkata',
    'house_system' => 'placidus',
    'node_type' => 'true',
];

$ch = curl_init('https://starsapi.com/api/v3/western/natal/chart-patterns');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($payload));
curl_setopt($ch, CURLOPT_HTTPHEADER, [
    'X-Api-Key: ' . getenv('STARSAPI_KEY'),
    'Content-Type: application/json'
]);

$response = curl_exec($ch);
$data = json_decode($response, true);

if ($data['success']) {
    print_r($data['data']);
}

import 'package:http/http.dart' as http;
import 'dart:convert';

Future<Map<String, dynamic>> getAscendant() async {
  final response = await http.post(
    Uri.parse('https://starsapi.com/api/v3/western/natal/chart-patterns'),
    headers: {
      'X-Api-Key': 'YOUR_API_KEY',
      'Content-Type': 'application/json',
    },
    body: jsonEncode({
      'year': 1990,
      'month': 5,
      'day': 20,
      'hour': 14,
      'minute': 30,
      'second': 0,
      'latitude': 28.6139,
      'longitude': 77.209,
      'timezone': 'Asia/Kolkata',
      'house_system': 'placidus',
      'node_type': 'true',
    }),
  );
  return jsonDecode(response.body);
}

import Foundation

func getAscendant() async throws -> [String: Any] {
    var request = URLRequest(url: URL(string:
        "https://starsapi.com/api/v3/western/natal/chart-patterns"
    )!)
    request.httpMethod = "POST"
    request.setValue("YOUR_API_KEY", forHTTPHeaderField: "X-Api-Key")
    request.setValue("application/json", forHTTPHeaderField: "Content-Type")
    request.httpBody = """
        {
            "year": 1990,
            "month": 5,
            "day": 20,
            "hour": 14,
            "minute": 30,
            "second": 0,
            "latitude": 28.6139,
            "longitude": 77.209,
            "timezone": "Asia/Kolkata",
            "house_system": "placidus",
            "node_type": "true"
        }
        """.data(using: .utf8)

    let (data, _) = try await URLSession.shared.data(for: request)
    return try JSONSerialization.jsonObject(with: data) as! [String: Any]
}

import okhttp3.*
import org.json.JSONObject

val client = OkHttpClient()
val JSON = "application/json; charset=utf-8".toMediaType()

fun getAscendant(callback: (JSONObject) -> Unit) {
    val payload = """
    {
        "year": 1990,
        "month": 5,
        "day": 20,
        "hour": 14,
        "minute": 30,
        "second": 0,
        "latitude": 28.6139,
        "longitude": 77.209,
        "timezone": "Asia/Kolkata",
        "house_system": "placidus",
        "node_type": "true"
    }
    """.trimIndent()

    val request = Request.Builder()
        .url("https://starsapi.com/api/v3/western/natal/chart-patterns")
        .addHeader("X-Api-Key", "YOUR_API_KEY")
        .post(payload.toRequestBody(JSON))
        .build()

    client.newCall(request).enqueue(object : Callback {
        override fun onResponse(call: Call, response: Response) {
            callback(JSONObject(response.body!!.string()))
        }
        override fun onFailure(call: Call, e: java.io.IOException) {
            e.printStackTrace()
        }
    })
}

package main

import (
    "bytes"
    "encoding/json"
    "fmt"
    "net/http"
    "os"
)

func main() {
    payload, _ := json.Marshal(map[string]interface{}{
        "year": 1990,
        "month": 5,
        "day": 20,
        "hour": 14,
        "minute": 30,
        "second": 0,
        "latitude": 28.6139,
        "longitude": 77.209,
        "timezone": "Asia/Kolkata",
        "house_system": "placidus",
        "node_type": "true",
    })

    req, _ := http.NewRequest("POST",
        "https://starsapi.com/api/v3/western/natal/chart-patterns",
        bytes.NewBuffer(payload))
    req.Header.Set("X-Api-Key", os.Getenv("STARSAPI_KEY"))
    req.Header.Set("Content-Type", "application/json")

    resp, _ := http.DefaultClient.Do(req)
    defer resp.Body.Close()

    var result map[string]interface{}
    json.NewDecoder(resp.Body).Decode(&result)
    fmt.Println(result["data"])
}

require 'net/http'
require 'json'

uri = URI('https://starsapi.com/api/v3/western/natal/chart-patterns')
payload = {
  'year' => 1990,
  'month' => 5,
  'day' => 20,
  'hour' => 14,
  'minute' => 30,
  'second' => 0,
  'latitude' => 28.6139,
  'longitude' => 77.209,
  'timezone' => 'Asia/Kolkata',
  'house_system' => 'placidus',
  'node_type' => 'true'
}

req = Net::HTTP::Post.new(uri)
req['X-Api-Key'] = ENV['STARSAPI_KEY']
req['Content-Type'] = 'application/json'
req.body = payload.to_json

http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true
res = http.request(req)

data = JSON.parse(res.body)
puts data['data'] if data['success']

200 RESPONSE

{
  "status": 200,
  "success": true,
  "data": {
    "patterns": [
      {
        "pattern": "T-Square",
        "planets": {
          "opposition": ["Mercury", "Pluto"],
          "apex": "North Node"
        },
        "modality": "Fixed",
        "apex_planet": "North Node",
        "description": "T-Square with North Node at the apex in Fixed modality — dynamic tension that drives action."
      },
      {
        "pattern": "Stellium",
        "type": "sign",
        "sign": "Capricorn",
        "planets": ["Saturn", "Uranus", "Neptune"],
        "count": 3,
        "description": "3 planets in Capricorn — intense concentration of energy in this sign's themes."
      }
    ],
    "summary": {
      "grand_trines": 0,
      "t_squares": 2,
      "grand_crosses": 0,
      "yods": 0,
      "kites": 0,
      "mystic_rectangles": 0,
      "stelliums": 2
    },
    "total_patterns": 4
  },
  "meta": { "endpoint": "/api/v3/western/natal/chart-patterns", "version": "3.0" }
}