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.

Endpoint

GET /v1/western/moon/calendar

Request parameters

Field	Type	Required	Description
year	integer | null	No	Year (e.g. 2026). Defaults to current year.
month	integer | null	No	Month number 1-12. Defaults to current month.

Example request

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);

Example response

{
  "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"
  ]
}

Response fields

Field	Type	Description
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

Code	Description	Reference
authentication_failed	Missing or invalid API key.	authentication_failed
ephemeris_unavailable	Upstream ephemeris service error.	ephemeris_unavailable
insufficient_tier	API key tier does not include this endpoint.	insufficient_tier
internal_error	Unexpected server error.	internal_error
ip_rate_limit_exceeded	Too many requests in a short window.	ip_rate_limit_exceeded
payload_too_large	Request body exceeds the size limit.	payload_too_large
resource_not_found	Referenced resource was not found.	resource_not_found
validation_error	Request body failed schema validation.	validation_error

Related endpoints

• Biorhythm Cycles
• Western Moon Phase