Astronomy

Sun Position & Shadow Length Simulator

Compute the sun’s elevation and azimuth (NOAA algorithm) for any latitude, longitude, date and time, plus the length and direction of the shadow cast by an object of a given height, with sunrise/sunset and a full-day shadow curve

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Quick start

Call this tool from your code in three languages.

cURL

curl -X POST 'https://api.elysiatools.com/en/api/tools/sun-position-shadow-simulator' \
  -H 'Content-Type: application/json' \
  -d '{"lat":40.7128,"lon":-74.006,"date":"2026-06-21","hour":12,"height":1.8,"tz":0,"timeBasis":"solar"}'

API reference

Send a POST request with your inputs as JSON. File parameters require a separate upload first.

Endpoint

HTTP

POST https://api.elysiatools.com/en/api/tools/sun-position-shadow-simulator

Parameters

Name	Type	Required	Description
lat	number	Yes	—
lon	number	Yes	—
date	date	Yes	—
hour	number	No	—
height	number	Yes	—
tz	number

MCP integration

Add this tool to your Model Context Protocol server so AI agents can list and call it.

Server configuration

Add this block to your MCP client configuration:

mcp.json

{
  "mcpServers": {
    "elysiatools-sun-position-shadow-simulator": {
      "name": "sun-position-shadow-simulator",
      "description": "Compute the sun’s elevation and azimuth (NOAA algorithm) for any latitude, longitude, date and time, plus the length and direction of the shadow cast by an object of a given height, with sunrise/sunset and a full-day shadow curve",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=sun-position-shadow-simulator",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

List available tools

After connecting to the SSE endpoint, list the exposed tools:

tools/list

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/list"
}

Call this tool

Invoke the tool by its id, passing arguments built from its parameters:

tools/call

{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": {
    "name": "sun-position-shadow-simulator",
    "arguments": {
  "lat": 40.7128,
  "lon": -74.006,
  "date": "2026-06-21",
  "hour": 12,
  "height": 1.8,
  "tz": 0,
  "timeBasis": "solar"
}
  }
}

Chain multiple tools in one session with a comma-separated toolId list, e.g. /mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp (max 20).

Questions or issues? Contact [email protected]

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