Astronomy
Galactic / Equatorial Coordinate Converter
Convert astronomical positions between equatorial (RA/Dec J2000 and B1950), galactic (l/b), and supergalactic (SGL/SGB) coordinate systems. Accurate J2000 IAU 1958 galactic rotation, de Vaucouleurs supergalactic system, and IAU 1976 precession between epochs. Accepts sexagesimal (12h51m26s) or decimal-degree input and shows all four systems for each object.
Quick start
Call this tool from your code in three languages.
curl -X POST 'https://api.elysiatools.com/en/api/tools/galactic-coordinate-converter' \
-H 'Content-Type: application/json' \
-d '{"coords":"05 34 31.94 +22 00 52.2","fromSystem":"eqJ2000","toSystem":"galactic","outputFormat":"both","precision":4}'API reference
Send a POST request with your inputs as JSON. File parameters require a separate upload first.
Endpoint
POST https://api.elysiatools.com/en/api/tools/galactic-coordinate-converterParameters
| Name | Type | Required | Description |
|---|---|---|---|
| coords | textarea | Yes | One coordinate per line. For equatorial: RA then Dec. For galactic/supergalactic: longitude then latitude (degrees). |
| fromSystem | select | No | — |
| toSystem | select | No | — |
| outputFormat | select | No | — |
| precision | number | Yes | Number of decimal places for decimal-degree output. |
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:
{
"mcpServers": {
"elysiatools-galactic-coordinate-converter": {
"name": "galactic-coordinate-converter",
"description": "Convert astronomical positions between equatorial (RA/Dec J2000 and B1950), galactic (l/b), and supergalactic (SGL/SGB) coordinate systems. Accurate J2000 IAU 1958 galactic rotation, de Vaucouleurs supergalactic system, and IAU 1976 precession between epochs. Accepts sexagesimal (12h51m26s) or decimal-degree input and shows all four systems for each object.",
"baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=galactic-coordinate-converter",
"command": "",
"args": [],
"env": {},
"isActive": true,
"type": "sse"
}
}
}List available tools
After connecting to the SSE endpoint, list the exposed tools:
{
"jsonrpc": "2.0",
"id": 1,
"method": "tools/list"
}Call this tool
Invoke the tool by its id, passing arguments built from its parameters:
{
"jsonrpc": "2.0",
"id": 2,
"method": "tools/call",
"params": {
"name": "galactic-coordinate-converter",
"arguments": {
"coords": "05 34 31.94 +22 00 52.2",
"fromSystem": "eqJ2000",
"toSystem": "galactic",
"outputFormat": "both",
"precision": 4
}
}
}