Astronomy Core

Sky data API for developers and AI agents

Positions, phases, rise/set, natal charts, and vectors — JSON over HTTPS. Powered by astronomy-engine (MIT).

Get started free Read the docs

What you get

  • Snapshots — full solar system state for any lat/lon/time
  • Bodies — moon phase, sun rise/set, planetary positions
  • Natal charts — ASC, MC, lunar nodes, houses, aspects
  • LLM-ready — /v1/capabilities, OpenAPI, hosted MCP at mcp.astronomycore.com

MCP for AI agents

Connect Cursor or Claude to https://mcp.astronomycore.com with your API key — sky tools with no local install.

MCP setup guide

Example

curl -H "Authorization: Bearer ac_live_..." \
  "https://api.astronomycore.com/v1/bodies/moon?latitude=41.9&longitude=12.5"

Free tier: 100 requests/day. Sign up for an API key.