Astronomy
Blue Hour Calculator
Calculate blue hour times - the magical time before sunrise and after sunset with deep blue skies
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/blue-hour' \
-H 'Content-Type: application/json' \
-d '{"latitude":0,"longitude":0,"date":"2026-11-07"}'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/blue-hourParameters
| Name | Type | Required | Description |
|---|---|---|---|
| latitude | number | Yes | — |
| longitude | number | Yes | — |
| date | date | Yes | — |
Response format
JSON result
JSON
{
"key": {...},
"metadata": {
"key": "value"
},
"error": "Error message (optional)",
"message": "Notification message (optional)"
}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-blue-hour": {
"name": "blue-hour",
"description": "Calculate blue hour times - the magical time before sunrise and after sunset with deep blue skies",
"baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=blue-hour",
"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": "blue-hour",
"arguments": {
"latitude": 0,
"longitude": 0,
"date": "2026-11-07"
}
}
}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]