Astronomy Oracle

Bundles 13,000+ deep sky objects from OpenNGC and runs all astronomy calculations locally with no API calls. Exposes three tools: lookup_object for detailed data on Messier, NGC, and IC objects with optional visibility computation, search_objects for filtering by type, constellation, magnitude, or size, and plan_session for generating observing lists optimized by altitude and time window. All coordinate transforms, rise/set times, and sidereal calculations happen deterministically in your runtime. Reach for this when you need Claude to stop hallucinating object magnitudes and coordinates, or when planning what's actually visible from your backyard tonight. Works offline once installed via npx.