Sunrise, sunset, twilight, golden hour and moon data for any point on Earth. One GET request, no key, no signup. Runs against the live API from your browser. Today https://api.sunrisesunset.io/json?lat=38.907192&lng=-77.036873 Copy Specific date https://api.sunrisesunset.io/json?lat=38.907192&lng=-77.036873&date=2026-06-21&timezone=UTC Copy One-year range https://api.sunrisesunset.io/json?lat=38.907192&lng=-77.036873&date_start=2026-01-01&date_end=2026-12-31 Copy 24-hour times https://api.sunrisesunset.io/json?lat=38.907192&lng=-77.036873&time_format=24 Copy Unix timestamps https://api.sunrisesunset.io/json?lat=38.907192&lng=-77.036873&time_format=unix Copy ISO 8601 https://api.sunrisesunset.io/json?lat=38.907192&lng=-77.036873&formatted=0 Copy Query-string values on a single GET request. Latitude in decimal degrees. Example 38.907192 Longitude in decimal degrees. Example -77.036873 Date to query. ISO YYYY-MM-DD, or a relative word like "today" or "tomorrow". Defaults to today in the location's timezone. Example 2026-06-21

Start of a date range (inclusive). Must be paired with date_end. Up to 365 days. End of a date range (inclusive). Returns an array of daily results instead of a single object. Return times in this timezone. Defaults to the location's IANA timezone resolved from lat/lng. An invalid value still returns data, with status INVALID_TZID and the detected zone. Default auto Example America/New_York Format of all time fields. One of 12, 24, military, unix. Unix timestamps are always UTC. Set to 0 to receive times in ISO 8601 format and day_length in seconds. Elevation override in meters. By default, auto-detected from terrain via ETOPO1. Pass false to compute at sea level. Higher elevation pushes sunrise earlier and sunset later. JSONP callback function name. Returns application/javascript wrapped in your callback when present. Response fields Wrapped in { results, status, tzid } . results is one object, or an array when you pass a date range. Returned in status . The HTTP status matches: 200 for OK and INVALID_TZID, 400 for bad input, 500 for server errors. Free for personal and commercial use. In return, put a visible link back to sunrisesunset.io on your site. For AI assistants A plain-text reference to paste into ChatGPT, Claude or Cursor before asking for code. It lists every parameter and field, plus the edge cases that trip up first drafts: nulls at the poles, utc_offset in minutes, times as strings rather than dates. There is also an OpenAPI 3.0 spec, as JSON or YAML , for Postman, Insomnia, or generating a typed client.