One place for the whole night sky
About Celest
Celest helps a beginner answer one simple question—what is worth seeing tonight—while giving experienced observers enough context to plan a better night under the stars.
Project information updated: 17 August 2026
Why Celest exists
Astronomy information is often scattered across technical tools, outdated calendars and weather apps. Celest brings sky events, observing conditions, Moon interference, darkness, light pollution and practical guidance into one modern, mobile-first experience.
What you can do here
- Check whether tonight is worth stargazing from your location.
- Explore a calendar of meteor showers, eclipses, Moon events and other sky phenomena.
- Use an interactive sky map and learn what is visible now.
- Understand weather, twilight, darkness, Moon impact and light pollution in plain language.
- Explore planets, constellations, bright stars, deep-sky objects, comets, satellites and space weather.
How the information is made
Celest combines deterministic astronomical calculations with public scientific and forecasting data. Sources currently include Astronomy Engine calculations and services from Open-Meteo, NASA, NOAA, CelesTrak, COBS, OpenStreetMap and other credited providers. Location-specific visibility remains an estimate and is explained as such.
Built for both languages
celestsky.com is the English home and celestsky.ro is the Romanian home. They share the same product while each domain keeps its own language, search metadata and canonical address.
Where the project is going
Celest is being developed in public stages: first the web experience, then reliable saved events and alerts, followed by Android and iOS apps. The goal is useful guidance without turning astronomy into an intimidating wall of numbers.