API & MCP

Everything a person can do on Skyfold Local Eclipse Circumstances, a program or AI agent can do with the same inputs and get the identical result.

HTTP API

POST https://skyfoldeclipselocal.usefulweb.app/api/v1/calculate – run Skyfold Local Eclipse Circumstances
GET https://skyfoldeclipselocal.usefulweb.app/api/v1/tool – inputs, output schema, examples
OpenAPI 3.1: /openapi.json · /openapi.yaml
Errors: application/problem+json; 422 includes per-field errors.

Skyfold Local Eclipse Circumstances

For a place, lists every solar and lunar eclipse from 2020 to 2040 with what you will see: partial, annular or total, contact times C1–C4, magnitude, obscuration, duration and the Sun or Moon altitude, computed from NASA Besselian elements.

Inputs of Skyfold Local Eclipse Circumstances
Field	Type	Default	Description
`location`	text	"42.3439, -3.6969"	Location (latitude, longitude). Decimal degrees such as 52.09, 5.12 (north and east positive), or DMS, UTM, MGRS, Maidenhead or a plus code.
`elevation`	number	0	Elevation above sea level
`timeZone`	text	"Europe/Madrid"	Time zone. IANA name such as Europe/Berlin or America/New_York, or a fixed offset such as UTC+2.
`fromYear`	integer	2026	From year
`toYear`	integer	2028	To year
`kind`	select (both, solar, lunar)	"both"	Eclipses
`visibleOnly`	boolean	true	Only eclipses visible from this place

Example request

Burgos, Spain: the 2026–2028 eclipses

curl -X POST https://skyfoldeclipselocal.usefulweb.app/api/v1/calculate -H 'content-type: application/json' -d '{"location":"42.3439, -3.6969","elevation":860,"timeZone":"Europe/Madrid","fromYear":2026,"toYear":2028,"kind":"both","visibleOnly":true}'

Every result contains

inputs (normalised, defaults applied), summary, result (validated against the published schema), units, assumptions, sources, warnings, computedAt and links.

MCP (Model Context Protocol)

Streamable HTTP endpoint: https://skyfoldeclipselocal.usefulweb.app/mcp – protocol revisions 2026-07-28 (stateless) and 2025-11-25 / 2025-06-18 / 2025-03-26 (initialize handshake).
Tools: skyfold_eclipse_local
Local stdio connector: node src/mcp-stdio.ts --tool=skyfold-eclipse-local

{
  "mcpServers": {
    "skyfold-eclipse-local": { "type": "http", "url": "https://skyfoldeclipselocal.usefulweb.app/mcp" }
  }
}