Clear skies,
under control
Astro weather, cloud maps, ISS passes, the Moon, light pollution and planets — everything to catch the perfect night for observing.
Free · no ads in the observing tools · Android
The sky right now
Live data for your location — tap a widget for details.
Everything for one perfect night
The tools that help you decide when and where to go observing.
Astro weather
Hourly forecast of cloud cover, humidity, wind and sky transparency with an observing-quality score.
Cloud map
Interactive multi-day cloud heat-map by altitude layers around your location.
Satellite passes
Live ground-track map and schedule of visible ISS, Tiangong and Hubble passes with alerts.
The Moon
Phases, illumination, rise and set, calendar and eclipses — the Moon is the main source of night-time glow.
Light pollution
Worldwide light-pollution levels so you can find dark skies near you.
Auroras
Current Kp index and aurora probability so you never miss a burst of activity.
Planets
Planet visibility, rise and set times and the best moments to observe.
Tonight's targets
Ranked object recommendations for observing and imaging under your conditions.
NASA & news
NASA's Astronomy Picture of the Day, solar activity and fresh space news.
Read the night at a glance — one score
AstroTools folds layered cloud cover, transparency, humidity, wind and the Moon phase into a single 0–100 score, so you know at once whether tonight is worth the drive.
- Hour-by-hour forecast several days ahead
- Three weather models: Open-Meteo, ECMWF and DWD ICON
- Moon influence and dew point factored in automatically
Catch the next clear night
Install AstroTools and plan your observing wherever you are.
Free · no ads in the observing tools · Android
From the blog
All articles →
Geminids 2026: the year's best meteor shower on the night of 13–14 December
The Geminids are the richest meteor shower of the year, up to 150 meteors an hour. In 2026 the peak falls on 13–14 December with almost no Moon in the sky.
Saturn at opposition on 4 October 2026: how to see the rings
On 4 October 2026 Saturn is closest to Earth and at its brightest for the year.
Supermoons on 24 November and 24 December 2026: when and how to watch
Two supermoons close out 2026 — 24 November and 24 December. December's is the closest full Moon of the year.