Sunrise & Sunset APIs
Daylight-time APIs differ mainly in scope. Sunrise Sunset and SunriseSunset.io are both free and need no key: the first returns sunrise, sunset, twilight, golden hour and sun position for up to a year per call, and the second adds blue hour and accepts a date range. The USNO Astronomical Applications API, from the U.S. Naval Observatory, gives daily rise and set times alongside seasons, eclipses and Julian dates. Free Weather APIs →
| API | Pricing | Auth | Format | Free tier | Status |
|---|---|---|---|---|---|
Sunrise SunsetSunrise, sunset, twilight, golden hour, sun position and moon phase for any coordinates, a year per call. Weather & Environment › Astronomy | Free | None | JSON | Unlimited | Live |
SunriseSunset.ioSunrise, sunset, twilight, golden and blue hour, moonrise and moon phase for any coordinates and date range. Weather & Environment › Astronomy | Free | None | JSON | Unlimited | Live |
USNO Astronomical Applications APIMoon phase dates, daily sun and moon rise/set, eclipses, seasons, Julian dates and sidereal time from USNO. Weather & Environment › Astronomy | None | JSON | Unlimited | Live |
Sunrise SunsetFreeLive
Sunrise, sunset, twilight, golden hour, sun position and moon phase for any coordinates, a year per call.
None · JSON
Unlimited
llms.txt
SunriseSunset.ioFreeLive
Sunrise, sunset, twilight, golden and blue hour, moonrise and moon phase for any coordinates and date range.
None · JSON
Unlimited
OpenAPI spec
USNO Astronomical Applications APILive
Moon phase dates, daily sun and moon rise/set, eclipses, seasons, Julian dates and sidereal time from USNO.
None · JSON
Unlimited
no machine-readable spec
Nothing matches that combination. Clear the filters and start from the category.
Choosing a Sunrise & Sunset API
Is there a free Sunrise & Sunset API?
Yes. Sunrise Sunset and SunriseSunset.io are free to use. See all free Weather APIs.
Which Sunrise & Sunset APIs work without an API key?
Sunrise Sunset, SunriseSunset.io and USNO Astronomical Applications API need no key or sign-up, so you can try them with a plain request.
Can I call a Sunrise & Sunset API from front-end JavaScript?
Sunrise Sunset, SunriseSunset.io and USNO Astronomical Applications API allow cross-origin requests and need no key, so they work straight from the browser. For the others, call them from your server so your key stays private.
Can I use Sunrise & Sunset APIs in a commercial project?
Sunrise Sunset and SunriseSunset.io permit commercial use.
Which Sunrise & Sunset APIs work with AI agents?
SunriseSunset.io publishes an OpenAPI spec for generating clients and tools.
Broader: Astronomy APIs · Weather & Environment APIs
More in Astronomy: Moon Phase APIs