Moon Phases API Reference

Overview

Moon Phases works by calculating the moon phase based on the date provided. It returns the moon phase in a structured format.

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/moonphases

curl "https://api.apiverve.com/v1/moonphases?today=true" \
  -H "x-api-key: your_api_key_here"

const res = await fetch('https://api.apiverve.com/v1/moonphases?today=true', {
  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/moonphases?today=true",
    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/moonphases?today=true", 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
`today`Optional	boolean	Get the moon phase for today default true

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": {
    "phase": "Waning Crescent",
    "phaseEmoji": "🌘",
    "illumination": 9.9,
    "waxing": false,
    "waning": true,
    "lunarAge": 26.61193415670738,
    "lunarAgePercent": 0.9011650706672754,
    "lunationNumber": 1274,
    "lunarDistance": 63.77810628163608,
    "nextFullMoon": "2026-01-16T00:00:00Z",
    "lastFullMoon": "2025-11-17T00:00:00Z",
    "daysToFullMoon": 28,
    "daysSinceFullMoon": 2
  }
}

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
`phase`	string	`"Waning Crescent"`	Current moon phase name
`phaseEmoji`	string	`"🌘"`	Emoji showing the current phase
`illumination`	number	`9.9`	Approximate illumination percentage (0-100)
`waxing`	boolean	`false`	Whether the illuminated fraction is growing
`waning`	boolean	`true`	Whether the illuminated fraction is shrinking
`lunarAge`	number	`26.61193415670738`	Days since the last new moon
`lunarAgePercent`	number	`0.9011650706672754`	How far through the lunar cycle the moon is, from 0 to 1
`lunationNumber`	number	`1274`	Which lunar cycle this is, counting from the new moon of January 1923
`lunarDistance`	number	`63.77810628163608`	Distance to the moon in Earth radii
`nextFullMoon`Premium	string	`"2026-01-16T00:00:00Z"`	Date of next full moon
`lastFullMoon`Premium	string	`"2025-11-17T00:00:00Z"`	Date of last full moon
`daysToFullMoon`Premium	number	`28`	Days until next full moon
`daysSinceFullMoon`Premium	number	`2`	Days since last full moon

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: Use the Moon Phases API to get moon phases for astrology. Use the data to study lunar cycles, track celestial events, and explore astrology
Gardening: Get moon phases by using the Moon Phases API for gardening. Use the data to plan planting, schedule harvests, and optimize crop growth
Outdoor Activities: Plan outdoor activities by using the Moon Phases API to get moon phases. Use the data to schedule events, organize trips, and optimize experiences

Other ways to use Moon Phases

Set up Moon Phases 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 →

Use it in 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 →

Moon Phases