Birth Chart API

The natal chart is the foundation of every astrology app (Co-Star, Sanctuary, The Pattern, Chani - all built on it). AstroWay API provides a full set of endpoints to build and analyze a chart in a single call: from basic planet positions on the same Swiss Ephemeris that powers Solar Fire and Astrodienst, to rare techniques competitors don’t ship - part of the 700+ endpoint platform.

What’s calculated

A full natal chart includes the astrology trinity - three “faces” of personality users come back to explore again and again (drives retention):

Planet positions: Sun (identity/purpose), Moon (emotional core/needs), Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto + the North Node (true Node in the response), Lilith (mean Apogee), Chiron. Longitude, latitude, speed, sign, house, retrograde.
House cusps: 15 systems available (Placidus, Koch, Whole Sign, Equal, others). ASC (how others perceive the user), MC (career/public image), Vertex.
Aspects: conjunction, opposition, trine, square, sextile, quincunx. Orb, applying/separating.
Chart sect: diurnal/nocturnal (for classical Hellenistic astrology in the Chris Brennan / Demetra George tradition).

To see this data drawn rather than as JSON, open the natal chart in the AstroWay app: same engine, same numbers, with the wheel and tables already rendered.

Endpoints

Endpoint	Credits	What it returns
`/v1/chart`	20	Full natal chart (planets + houses + aspects)
`/v1/planets`	10	Planet positions only (no houses or aspects)
`/v1/essential-dignities`	20	Essential dignities table (domicile, exaltation, triplicity, term, face)
`/v1/almuten`	20	Almuten figuris - medieval technique
`/v1/arabic-parts`	20	Arabic parts/lots (Fortuna, Spirit, others)
`/v1/fixed-stars`	20	Planet conjunctions with fixed stars
`/v1/midpoints`	20	Planetary midpoints
`/v1/disposition-chains`	20	Disposition chains (rulership graphs)
`/v1/firdaria`	20	Firdaria periods
`/v1/profections`	20	Annual profections
`/v1/planetary-phases`	20	Oriental/occidental phases
`/v1/receptions`	20	Mutual receptions

Example

curl -X POST https://api.astroway.info/v1/chart \
  -H "X-Api-Key: aw_live_your_key_here" \
  -H "Content-Type: application/json" \
  -d '{
    "date": "1990-07-14",
    "time": "14:30:00",
    "timezoneOffset": 3,
    "latitude": 50.4501,
    "longitude": 30.5234,
    "houseSystem": "P"
  }'

const r = await fetch('https://api.astroway.info/v1/chart', {
  method: 'POST',
  headers: {
    'X-Api-Key': process.env.ASTROWAY_API_KEY!,
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    date: '1990-07-14',
    time: '14:30:00',
    timezoneOffset: 3,
    latitude: 50.4501,
    longitude: 30.5234,
    houseSystem: 'P',
  }),
});
const { data: chart } = await r.json();
console.log(`ASC: ${chart.houses.ascendant.toFixed(2)}° MC: ${chart.houses.mc.toFixed(2)}°`);

import os, requests

r = requests.post(
    'https://api.astroway.info/v1/chart',
    headers={'X-Api-Key': os.environ['ASTROWAY_API_KEY'], 'Content-Type': 'application/json'},
    json={
        'date': '1990-07-14',
        'time': '14:30:00',
        'timezoneOffset': 3,
        'latitude': 50.4501,
        'longitude': 30.5234,
        'houseSystem': 'P',
    },
)
chart = r.json()['data']
print(f"ASC: {chart['houses']['ascendant']:.2f}° MC: {chart['houses']['mc']:.2f}°")

<?php
use GuzzleHttp\Client;

$aw = new Client(['base_uri' => 'https://api.astroway.info/v1/']);
$r = $aw->post('chart', [
    'headers' => ['X-Api-Key' => getenv('ASTROWAY_API_KEY')],
    'json' => [
        'date' => '1990-07-14',
        'time' => '14:30:00',
        'timezoneOffset' => 3,
        'latitude' => 50.4501,
        'longitude' => 30.5234,
        'houseSystem' => 'P',
    ],
]);
$chart = json_decode($r->getBody(), true)['data'];
printf("ASC: %.2f° MC: %.2f°\n", $chart['houses']['ascendant'], $chart['houses']['mc']);