Moon Phases

Overview

A moon phase and lunar phase API that returns the phases of the moon as JSON, with an emoji icon for each phase you can drop straight into a weather or calendar UI. Moon Phases works by calculating the moon phase based on the date provided. Every response names the next principal phase, and paid plans add when it arrives plus the next and last new moon, the next first and last quarters, and the next and last full moon, all from the mean lunar month, so they are approximate to within about a day.

Live Test Moon Phases 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.

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

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const res = await fetch('https://api.apiverve.com/v1/moonphases?today=true&phases=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);

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import requests

res = requests.get(
    "https://api.apiverve.com/v1/moonphases?today=true&phases=true",
    headers={"x-api-key": "your_api_key_here"},
    timeout=15,
)
res.raise_for_status()

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

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package main

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

func main() {
	req, _ := http.NewRequest("GET", "https://api.apiverve.com/v1/moonphases?today=true&phases=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.

Parameters

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

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.

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{
  "status": "ok",
  "error": null,
  "data": {
    "date": "2026-10-27",
    "phase": "Full",
    "phaseEmoji": "🌕",
    "illumination": 98.8,
    "waxing": false,
    "waning": true,
    "lunarAge": 15.775469393347242,
    "lunarAgePercent": 0.534207769602574,
    "lunationNumber": 1285,
    "lunarDistance": 57.48396905317442,
    "nextFullMoon": "2026-11-24T17:29:23.611Z",
    "lastFullMoon": "2026-10-26T04:45:20.833Z",
    "daysToFullMoon": 29,
    "daysSinceFullMoon": 1,
    "lunarDistanceKm": 366230,
    "nextPhase": "Last Quarter",
    "nextPhaseDate": "2026-11-02T13:56:21.527Z",
    "daysToNextPhase": 6,
    "nextNewMoon": "2026-11-09T23:07:22.222Z",
    "lastNewMoon": "2026-10-11T10:23:19.444Z",
    "daysToNewMoon": 14,
    "daysSinceNewMoon": 16,
    "nextFirstQuarter": "2026-11-17T08:18:22.916Z",
    "nextLastQuarter": "2026-11-02T13:56:21.527Z"
  }
}

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.

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.

Use cases

Night Sky Photography

Astrophotographers check lunar illumination and waxing status to schedule dark-sky Milky Way shoots around the new moon.

Biodynamic Planting Calendars

Gardening software aligns root and above-ground crop sowing schedules using lunar cycle progression and current lunar age.

Stargazing Event Planning

When planning evening telescope sessions, observatory guides inspect illumination percentages to schedule viewing nights under pitch-black skies.

Fishing Forecast Dashboards

Forecast peak feeding activity by pairing lunation numbers and waxing indicators with local marine tables in fishing apps.

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.

Related

More in Astrology: