GET/v1/western/moon/calendar

Western Moon Phase Calendar

Returns lunar phase data for every day in a given month. Useful for building moon phase calendars, identifying full/new moons, and auspicious timing tools. Defaults to current month if no year/month given.

Request parameters

yearoptional

integer | null

Year (e.g. 2026). Defaults to current year.

monthoptional

integer | null

Month number 1-12. Defaults to current month.

Response fields

success

boolean

True if the request succeeded

message

string

Human-readable status message

data

array[object]

The endpoint response payload

data[].date

string

Date in YYYY-MM-DD format

data[].phase_name

string

Current phase name

data[].phase_angle

number

Phase angle in degrees (0-360). 0=New Moon, 180=Full Moon

data[].illumination_pct

number

Percentage of Moon disk illuminated (0-100)

data[].moon_age_days

number

Days elapsed since last New Moon (0 to 29.53)

data[].moon_longitude

number

Tropical ecliptic longitude of Moon (0-360)

data[].sun_longitude

number

Tropical ecliptic longitude of Sun (0-360)

data[].is_waxing

boolean

True if Moon is waxing (phase_angle < 180)

data[].next_phase_name

string

Name of the next major phase

data[].next_phase_date

string | null

Estimated date of next major phase (YYYY-MM-DD)

Errors

authentication_failed

Missing or invalid API key.

ephemeris_unavailable

Upstream ephemeris service error.

insufficient_tier

API key tier does not include this endpoint.

internal_error

Unexpected server error.

ip_rate_limit_exceeded

Too many requests in a short window.

payload_too_large

Request body exceeds the size limit.

resource_not_found

Referenced resource was not found.

validation_error

Request body failed schema validation.

Related endpoints

• Biorhythm Cycles
• Western Moon Phase

Request

GET·application/json

curl

curl -X GET "https://api.asterwise.com/v1/western/moon/calendar?year=2026&month=1" \
  -H "Authorization: Bearer YOUR_API_KEY"

Python

import asterwise
from asterwise.api.western_astrology_api import WesternAstrologyApi

configuration = asterwise.Configuration(
    host="https://api.asterwise.com",
    access_token="YOUR_API_KEY",
)

with asterwise.ApiClient(configuration) as client:
    api = WesternAstrologyApi(client)
    result = api.western_moon_calendar(year=2026,
    month=1)
    print(result)

TypeScript

import { createClient, createConfig, westernMoonCalendar } from 'asterwise';

const client = createClient(createConfig({
  baseUrl: 'https://api.asterwise.com',
  headers: { Authorization: 'Bearer YOUR_API_KEY' },
}));

const result = await westernMoonCalendar({
  client,
  query: {
      "year": 2026,
      "month": 1
  },
});

console.log(result.data);

Response

200 OK·application/jsonsigned

{
  "success": true,
  "message": "success",
  "data": [
    {
      "date": "2026-01-01",
      "phase_name": "Waxing Gibbous",
      "phase_angle": 156.6555,
      "illumination_pct": 95.91,
      "moon_age_days": 12.85,
      "moon_longitude": 77.98827,
      "sun_longitude": 281.332736,
      "is_waxing": true,
      "next_phase_name": "Full Moon",
      "next_phase_date": "2026-01-03"
    },
    {
      "date": "2026-01-02",
      "phase_name": "Waxing Gibbous",
      "phase_angle": 170.6837,
      "illumination_pct": 99.34,
      "moon_age_days": 14.0,
      "moon_longitude": 93.035257,
      "sun_longitude": 282.351595,
      "is_waxing": true,
      "next_phase_name": "Full Moon",
      "next_phase_date": "2026-01-03"
    },
    "... and 29 more items"
  ]
}