Birth Chart API Reference

Overview

Planet positions are apparent geocentric longitudes on the true ecliptic of date, from the astronomy-engine ephemeris. House cusps use Placidus by default, with whole sign and equal houses as options. When no timezone is given it is looked up from the coordinates, and births from before a region adopted standard time use the birthplace's local mean time.

Live Test Birth Chart API →

Endpoint

One host, one path per API. The block below shows this call in four languages; every one of them is the same HTTP request. Making requests covers the timeouts, retries and parameter rules that apply to all of them. The SDKs wrap the same call in a typed client.

GEThttps://api.apiverve.com/v1/birthchart

1
2

curl "https://api.apiverve.com/v1/birthchart?date=1990-06-15&time=14%3A30&lat=40.7128&lon=-74.006&timezone=America%2FNew_York&houseSystem=placidus" \
  -H "x-api-key: your_api_key_here"

const res = await fetch('https://api.apiverve.com/v1/birthchart?date=1990-06-15&time=14%3A30&lat=40.7128&lon=-74.006&timezone=America%2FNew_York&houseSystem=placidus', {
  headers: { 'x-api-key': 'your_api_key_here' },
});

if (!res.ok) throw new Error(`${res.status} ${await res.text()}`);

const { data } = await res.json();
console.log(data);

import requests

res = requests.get(
    "https://api.apiverve.com/v1/birthchart?date=1990-06-15&time=14%3A30&lat=40.7128&lon=-74.006&timezone=America%2FNew_York&houseSystem=placidus",
    headers={"x-api-key": "your_api_key_here"},
    timeout=15,
)
res.raise_for_status()

print(res.json()["data"])

package main

import (
	"fmt"
	"io"
	"net/http"
)

func main() {
	req, _ := http.NewRequest("GET", "https://api.apiverve.com/v1/birthchart?date=1990-06-15&time=14%3A30&lat=40.7128&lon=-74.006&timezone=America%2FNew_York&houseSystem=placidus", nil)
	req.Header.Set("x-api-key", "your_api_key_here")

	res, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()

	out, _ := io.ReadAll(res.Body)
	fmt.Println(string(out))
}

Replace your_api_key_here with the key from your dashboard. When the inputs arrive as a list rather than one at a time, batch requests run up to 200 of them through this same API in a single call.

Authentication

Send your key in the x-api-key header. That is the only auth step — there is no token exchange and no per-endpoint scope to configure. Authentication covers creating, rotating and revoking keys.

401 is the only auth verdict

A 401 means the key is missing, invalid or expired. A 403 means the key is valid but not permitted here — blocked by a key restriction or an IP allow-list. Running out of credits is a 429.

Parameters

Sent in the query string. Premium parameters are accepted on every plan but only take effect on plans that include them.

Parameter	Type	Description
`date`Required	string	The birth date (YYYY-MM-DD or MM-DD-YYYY), between 1700 and 2200
`time`Required	string	The local birth time in 24-hour HH:mm format
`lat`Required	number	The latitude of the birthplace range -90–90
`lon`Required	number	The longitude of the birthplace (east positive) range -180–180
`timezone`Optional	string	An IANA timezone name (America/New_York) or a UTC offset (+05:30). Looked up from the coordinates when omitted timezone
`houseSystem`Optional	string	The house system to use `placiduswholesignequal` default placidus

Response

Every API returns the same three top-level keys, so one response handler covers your whole integration: status, error and data. Only data changes shape. Response format covers the envelope, the other output formats and how premium fields are withheld.

Sample response

{
  "status": "ok",
  "error": null,
  "data": {
    "birth": {
      "localTime": "1990-06-15T14:30",
      "utcTime": "1990-06-15T18:30:00Z",
      "timezone": "America/New_York",
      "utcOffset": "-04:00",
      "offsetSource": "location",
      "latitude": 40.7128,
      "longitude": -74.006
    },
    "houseSystem": "placidus",
    "sunSign": "Gemini",
    "moonSign": "Pisces",
    "risingSign": "Libra",
    "ascendant": {
      "sign": "Libra",
      "degree": 13.7,
      "longitude": 193.6954,
      "formatted": "13°42' Libra"
    },
    "midheaven": {
      "sign": "Cancer",
      "degree": 15.92,
      "longitude": 105.9221,
      "formatted": "15°55' Cancer"
    },
    "planets": [
      {
        "name": "Sun",
        "sign": "Gemini",
        "degree": 24.39,
        "longitude": 84.3882,
        "formatted": "24°23' Gemini",
        "house": 9,
        "retrograde": false,
        "speed": 0.9551
      },
      {
        "name": "Moon",
        "sign": "Pisces",
        "degree": 18.99,
        "longitude": 348.9903,
        "formatted": "18°59' Pisces",
        "house": 6,
        "retrograde": false,
        "speed": 13.4613
      },
      {
        "name": "Mercury",
        "sign": "Gemini",
        "degree": 6.16,
        "longitude": 66.1572,
        "formatted": "6°09' Gemini",
        "house": 8,
        "retrograde": false,
        "speed": 1.7285
      },
      {
        "name": "Venus",
        "sign": "Taurus",
        "degree": 19.1,
        "longitude": 49.0959,
        "formatted": "19°06' Taurus",
        "house": 8,
        "retrograde": false,
        "speed": 1.1763
      },
      {
        "name": "Mars",
        "sign": "Aries",
        "degree": 11.24,
        "longitude": 11.2357,
        "formatted": "11°14' Aries",
        "house": 6,
        "retrograde": false,
        "speed": 0.7186
      },
      {
        "name": "Jupiter",
        "sign": "Cancer",
        "degree": 15.95,
        "longitude": 105.9482,
        "formatted": "15°57' Cancer",
        "house": 10,
        "retrograde": false,
        "speed": 0.2168
      },
      {
        "name": "Saturn",
        "sign": "Capricorn",
        "degree": 24.02,
        "longitude": 294.016,
        "formatted": "24°01' Capricorn",
        "house": 4,
        "retrograde": true,
        "speed": -0.0589
      },
      {
        "name": "Uranus",
        "sign": "Capricorn",
        "degree": 8.15,
        "longitude": 278.1534,
        "formatted": "8°09' Capricorn",
        "house": 3,
        "retrograde": true,
        "speed": -0.039
      },
      {
        "name": "Neptune",
        "sign": "Capricorn",
        "degree": 13.71,
        "longitude": 283.7101,
        "formatted": "13°43' Capricorn",
        "house": 3,
        "retrograde": true,
        "speed": -0.0251
      },
      {
        "name": "Pluto",
        "sign": "Scorpio",
        "degree": 15.4,
        "longitude": 225.3967,
        "formatted": "15°24' Scorpio",
        "house": 2,
        "retrograde": true,
        "speed": -0.0201
      },
      {
        "name": "North Node",
        "sign": "Aquarius",
        "degree": 9.68,
        "longitude": 309.68,
        "formatted": "9°41' Aquarius",
        "house": 4,
        "retrograde": true,
        "speed": -0.053
      }
    ],
    "houses": [
      {
        "house": 1,
        "sign": "Libra",
        "degree": 13.7,
        "longitude": 193.6954,
        "formatted": "13°42' Libra"
      },
      {
        "house": 2,
        "sign": "Scorpio",
        "degree": 10.77,
        "longitude": 220.7713,
        "formatted": "10°46' Scorpio"
      },
      {
        "house": 3,
        "sign": "Sagittarius",
        "degree": 11.92,
        "longitude": 251.9193,
        "formatted": "11°55' Sagittarius"
      },
      {
        "house": 4,
        "sign": "Capricorn",
        "degree": 15.92,
        "longitude": 285.9221,
        "formatted": "15°55' Capricorn"
      },
      {
        "house": 5,
        "sign": "Aquarius",
        "degree": 19.31,
        "longitude": 319.3054,
        "formatted": "19°18' Aquarius"
      },
      {
        "house": 6,
        "sign": "Pisces",
        "degree": 18.9,
        "longitude": 348.9027,
        "formatted": "18°54' Pisces"
      },
      {
        "house": 7,
        "sign": "Aries",
        "degree": 13.7,
        "longitude": 13.6954,
        "formatted": "13°42' Aries"
      },
      {
        "house": 8,
        "sign": "Taurus",
        "degree": 10.77,
        "longitude": 40.7713,
        "formatted": "10°46' Taurus"
      },
      {
        "house": 9,
        "sign": "Gemini",
        "degree": 11.92,
        "longitude": 71.9193,
        "formatted": "11°55' Gemini"
      },
      {
        "house": 10,
        "sign": "Cancer",
        "degree": 15.92,
        "longitude": 105.9221,
        "formatted": "15°55' Cancer"
      },
      {
        "house": 11,
        "sign": "Leo",
        "degree": 19.31,
        "longitude": 139.3054,
        "formatted": "19°18' Leo"
      },
      {
        "house": 12,
        "sign": "Virgo",
        "degree": 18.9,
        "longitude": 168.9027,
        "formatted": "18°54' Virgo"
      }
    ],
    "aspects": [
      {
        "planet1": "Moon",
        "planet2": "Venus",
        "aspect": "sextile",
        "angle": 60,
        "orb": 0.11,
        "applying": true
      },
      {
        "planet1": "Jupiter",
        "planet2": "Pluto",
        "aspect": "trine",
        "angle": 120,
        "orb": 0.55,
        "applying": false
      },
      {
        "planet1": "Mars",
        "planet2": "North Node",
        "aspect": "sextile",
        "angle": 60,
        "orb": 1.56,
        "applying": false
      },
      {
        "planet1": "Neptune",
        "planet2": "Pluto",
        "aspect": "sextile",
        "angle": 60,
        "orb": 1.69,
        "applying": false
      },
      {
        "planet1": "Jupiter",
        "planet2": "Neptune",
        "aspect": "opposition",
        "angle": 180,
        "orb": 2.24,
        "applying": false
      },
      {
        "planet1": "Mars",
        "planet2": "Neptune",
        "aspect": "square",
        "angle": 90,
        "orb": 2.47,
        "applying": true
      },
      {
        "planet1": "Moon",
        "planet2": "Jupiter",
        "aspect": "trine",
        "angle": 120,
        "orb": 3.04,
        "applying": false
      },
      {
        "planet1": "Mars",
        "planet2": "Uranus",
        "aspect": "square",
        "angle": 90,
        "orb": 3.08,
        "applying": false
      },
      {
        "planet1": "Venus",
        "planet2": "Jupiter",
        "aspect": "sextile",
        "angle": 60,
        "orb": 3.15,
        "applying": false
      },
      {
        "planet1": "Mercury",
        "planet2": "North Node",
        "aspect": "trine",
        "angle": 120,
        "orb": 3.52,
        "applying": true
      },
      {
        "planet1": "Moon",
        "planet2": "Pluto",
        "aspect": "trine",
        "angle": 120,
        "orb": 3.59,
        "applying": false
      },
      {
        "planet1": "Venus",
        "planet2": "Pluto",
        "aspect": "opposition",
        "angle": 180,
        "orb": 3.7,
        "applying": false
      },
      {
        "planet1": "Mars",
        "planet2": "Jupiter",
        "aspect": "square",
        "angle": 90,
        "orb": 4.71,
        "applying": true
      },
      {
        "planet1": "Venus",
        "planet2": "Saturn",
        "aspect": "trine",
        "angle": 120,
        "orb": 4.92,
        "applying": true
      },
      {
        "planet1": "Moon",
        "planet2": "Saturn",
        "aspect": "sextile",
        "angle": 60,
        "orb": 5.03,
        "applying": true
      },
      {
        "planet1": "Mercury",
        "planet2": "Mars",
        "aspect": "sextile",
        "angle": 60,
        "orb": 5.08,
        "applying": true
      },
      {
        "planet1": "Moon",
        "planet2": "Neptune",
        "aspect": "sextile",
        "angle": 60,
        "orb": 5.28,
        "applying": false
      },
      {
        "planet1": "Venus",
        "planet2": "Neptune",
        "aspect": "trine",
        "angle": 120,
        "orb": 5.39,
        "applying": false
      },
      {
        "planet1": "Sun",
        "planet2": "Moon",
        "aspect": "square",
        "angle": 90,
        "orb": 5.4,
        "applying": true
      },
      {
        "planet1": "Uranus",
        "planet2": "Neptune",
        "aspect": "conjunction",
        "angle": 0,
        "orb": 5.56,
        "applying": false
      },
      {
        "planet1": "Pluto",
        "planet2": "North Node",
        "aspect": "square",
        "angle": 90,
        "orb": 5.72,
        "applying": false
      },
      {
        "planet1": "Jupiter",
        "planet2": "Uranus",
        "aspect": "opposition",
        "angle": 180,
        "orb": 7.79,
        "applying": false
      }
    ],
    "elements": {
      "fire": 1,
      "earth": 4,
      "air": 2,
      "water": 3
    },
    "modalities": {
      "cardinal": 5,
      "fixed": 2,
      "mutable": 3
    }
  }
}

Response fields

Paths are relative to data. Premium fields are absent rather than zeroed on plans that do not include them, so check for presence instead of comparing to 0.

Field	Type	Example	Description
`birth`	object	`{...}`	The birth moment and place the chart was calculated for
`localTime`	string	`"1990-06-15T14:30"`	The local birth time as given
`utcTime`	string	`"1990-06-15T18:30:00Z"`	The birth time converted to UTC (ISO 8601)
`timezone`	string	`"America/New_York"`	The IANA timezone used, or null when a fixed offset was given
`utcOffset`	string	`"-04:00"`	The UTC offset applied, such as -04:00
`offsetSource`	string	`"location"`	Where the offset came from: timezone, offset, location or local mean time
`latitude`	number	`40.7128`	Latitude of the birthplace
`longitude`	number	`-74.006`	Longitude of the birthplace
`houseSystem`	string	`"placidus"`	The house system used
`sunSign`	string	`"Gemini"`	The zodiac sign of the sun
`moonSign`	string	`"Pisces"`	The zodiac sign of the moon
`risingSign`	string	`"Libra"`	The rising sign (the sign of the ascendant)
`ascendant`	object	`{...}`	The ascendant: sign, degree within the sign, ecliptic longitude and a formatted position
`sign`	string	`"Libra"`	Sign of the ascendant
`degree`	number	`13.7`	Degree within the sign (0-30)
`longitude`	number	`193.6954`	Ecliptic longitude (0-360)
`formatted`	string	`"13°42' Libra"`	Position as degrees and minutes, such as 11°39' Cancer
`midheaven`	object	`{...}`	The midheaven (MC), in the same shape as ascendant
`sign`	string	`"Cancer"`	Sign of the midheaven
`degree`	number	`15.92`	Degree within the sign (0-30)
`longitude`	number	`105.9221`	Ecliptic longitude (0-360)
`formatted`	string	`"15°55' Cancer"`	Position as degrees and minutes
`planets`	array[11]		The sun, moon, eight planets and the mean north node
`name`	string	`"Sun"`	Body name
`sign`	string	`"Gemini"`	Zodiac sign
`degree`	number	`24.39`	Degree within the sign (0-30)
`longitude`	number	`84.3882`	Tropical ecliptic longitude (0-360)
`formatted`	string	`"24°23' Gemini"`	Position as degrees and minutes, such as 23°30' Pisces
`house`Premium	number	`9`	The house (1-12) the body falls in
`retrograde`	boolean	`false`	True when the body is in apparent backward motion
`speed`	number	`0.9551`	Daily motion in degrees of longitude (negative when retrograde)
`houses`Premium	array[12]		The 12 house cusps in the chosen house system
`house`Premium	number	`1`	House number (1-12)
`sign`Premium	string	`"Libra"`	Sign on the cusp
`degree`Premium	number	`13.7`	Degree of the cusp within the sign
`longitude`Premium	number	`193.6954`	Ecliptic longitude of the cusp
`formatted`Premium	string	`"13°42' Libra"`	Cusp position as degrees and minutes
`aspects`Premium	array[22]		Major aspects between bodies, tightest orb first
`planet1`Premium	string	`"Moon"`	First body
`planet2`Premium	string	`"Venus"`	Second body
`aspect`Premium	string	`"sextile"`	conjunction, opposition, trine, square or sextile
`angle`Premium	number	`60`	The exact angle of the aspect
`orb`Premium	number	`0.11`	Degrees away from exact
`applying`Premium	boolean	`true`	True when the aspect is moving toward exact
`elements`Premium	object	`{...}`	Count of the ten planets in fire, earth, air and water signs
`fire`Premium	number	`1`
`earth`Premium	number	`4`
`air`Premium	number	`2`
`water`Premium	number	`3`
`modalities`Premium	object	`{...}`	Count of the ten planets in cardinal, fixed and mutable signs
`cardinal`Premium	number	`5`
`fixed`Premium	number	`2`
`mutable`Premium	number	`3`

Errors

Read the HTTP status first, then error for the specific reason. The body names the parameter that has to change. Error handling covers the full status list and which of them are worth retrying.

Status	Meaning	What to do
`400`	Input was rejected	Read `error`; it names the parameter.
`401`	Key missing or invalid	Check the header name and the key value.
`403`	Key valid, but not permitted	A key restriction or IP allow-list; see key scoping.
`429`	Rate limited, or out of credits	Read `error` to tell them apart; see rate limits.

Use cases

Astrology Apps: Generate a user's natal chart at sign-up from their birth details, and show the sun, moon and rising signs on their profile.
Compatibility Features: Calculate two charts and compare planet signs, elements and aspects to power a compatibility or matching feature.
Personalised Content: Pick daily content, readings or product recommendations by the user's rising sign, moon sign or dominant element.
Chart Rendering: Feed planet longitudes, house cusps and aspects into a chart wheel drawn in your own app.

Other ways to use Birth Chart

Set up Birth Chart on APIVerve, or reach the same source a different way. Your APIVerve account and credits work on all of them — one key, one balance.

Give it to an AI agentConnect over MCP and your agent calls it as a native tool — Claude, Cursor, ChatGPT.VerveKit →Reference →

Google Sheets or ExcelA =VERVE() formula fills a column — no script, no export, recalculates in place.VerveSheets →Reference →

Ground an agent on itA cited, machine-checkable fact your model can't produce on its own.VerveContext →Reference →

Birth Chart