API documentation
Quickstart guides, parameter reference, and tier-by-tier feature matrices.
Ephemerides
Sun and moon rise/set times for any latitude, longitude, AND elevation on Earth — elevation correction is unique among ephemerides APIs. Includes twilight phases, transit times, and lunar phase.
Solar
Precision solar geometry and clear-sky irradiance for any location on Earth. Solar position (azimuth/altitude/zenith), Direct, Diffuse and Global Horizontal Irradiance under clear-sky conditions, and Daily Light Integral for agriculture. Backed by NREL SPA-equivalent computation (JPL DE421) and the Bird Clear Sky Model, with elevation as a first-class input.
Tides
Astronomical tide heights, high/low waters, harmonic constituents and combined tide+sun/moon windows for any coastal point on Earth, computed from the FES2022 global tide atlas. Any date, past or future.
MCP server
Connect Claude, Cursor or any MCP client straight to the data — no integration to write. Paid plans.
Webhooks
Cross-product event subscriptions. HMAC-signed deliveries, exponential-backoff retry, idempotency keys. Pro+ tier.