Astronomy
Sidereal Time and Precession Planner
Plan observations with local sidereal time, optional nutation, precessed coordinates, and altitude/azimuth slots.
json· JSON resultOpen tool
Quick start
Call this tool from your code in three languages.
cURL
curl -X POST 'https://api.elysiatools.com/en/api/tools/astronomical-sidereal-time-precession-planner' \
-H 'Content-Type: application/json' \
-d '{"dateTimeUtc":"2026-08-01T00:00:00Z","latitude":40.7128,"longitude":-74.006,"rightAscensionHours":18.615,"declinationDegrees":-24.5,"coordinateEpoch":"J2000.0","applyNutation":true,"slotCount":3,"slotIntervalMinutes":30}'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/astronomical-sidereal-time-precession-plannerParameters
| Name | Type | Required | Description |
|---|---|---|---|
| dateTimeUtc | text | Yes | — |
| latitude | number | Yes | — |
| longitude | number | Yes | — |
| rightAscensionHours | number | Yes | — |
| declinationDegrees | number | Yes | — |
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-astronomical-sidereal-time-precession-planner": {
"name": "astronomical-sidereal-time-precession-planner",
"description": "Plan observations with local sidereal time, optional nutation, precessed coordinates, and altitude/azimuth slots.",
"baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=astronomical-sidereal-time-precession-planner",
"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": "astronomical-sidereal-time-precession-planner",
"arguments": {
"dateTimeUtc": "2026-08-01T00:00:00Z",
"latitude": 40.7128,
"longitude": -74.006,
"rightAscensionHours": 18.615,
"declinationDegrees": -24.5,
"coordinateEpoch": "J2000.0",
"applyNutation": true,
"slotCount": 3,
"slotIntervalMinutes": 30
}
}
}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).