SunriseSunset.io API
Free, keyless JSON API for sunrise, sunset, twilight, golden hour, and moon data anywhere on Earth.
A single GET endpoint (https://api.sunrisesunset.io/json) that returns sunrise, sunset, solar noon, day length, civil/nautical/astronomical twilight, golden and blue hour windows, sun azimuth/altitude, and moonrise/moonset/phase/illumination for any latitude/longitude and date. No API key or signup required; GET only, CORS enabled, JSONP supported. Supports date ranges up to 365 days, multiple time formats (12/24/military/unix), ISO 8601 output, timezone override, and elevation override (auto-detected from ETOPO1 terrain data). Free for personal and commercial use with a required visible attribution link. Optional API keys available for higher limits. Served from Cloudflare's edge with stated P99 latency under 50 ms.
- Category
- APIs & backend
- Pricing
- free
- Free tier
- yes
- API
- yes
- MCP server
- no
- SDK
- no
- Open source
- no
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Listed 2026-10-24 · last verified 2026-10-24 · extracted by @cf/zai-org/glm-5.3-flash · confidence 0.95
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API
curl https://toolgrep.com/api/products/sunrisesunset-io-api