What is above you, in the sky tonight, under your feet and around you, live.
Starting upThe globe above is a free 3D view of what is over, under and around a place you choose.
These figures load from the site's live data in your browser.
Each page below is rebuilt when its own feed has new data and states the time of its own data. When a feed is too old or fails a check, the page keeps its previous copy.
Search for ISS and the globe turns to the station, drawing its orbit and the patch of Earth it can see. Its card gives its height, speed and the age of the orbit data, which comes from CelesTrak; positions are worked out on your device. Pass predictions for the station, the brightest objects and anything launched within the past 30 days use SGP4, the model built for this kind of orbit data. Everything else uses a quicker, rougher model.
Choose where you are: search the place list, which reaches down to towns of roughly 15,000 inhabitants, or let the app use your device's position, which stays on the device. A tile at the top then counts the tracked objects (satellites, rocket bodies and debris) 10 degrees or more above the horizon there right now, and the Sky view draws them across your sky, flashing when sunlit. Tap one for its name, how high it is, which way to face and how far away it is.
The Tonight button gives one verdict for your place from the Moon, the dark hours, the chance of aurora and, in the six cities that have one, the cloud forecast. Below it, a timeline shows what to watch for and when: passes of the ISS and other satellites, Starlink strings, planets, and meteor showers close to their peak, each with Show me and Remind me buttons. The Sky view is a first-person sky for any place, with the Moon and its phase, the planets, the officially named stars, the constellation figures and a slider through the night. A sky calendar looks 90 days ahead at Moon phases, eclipses, planet events and meteor showers.
The Under view slices the Earth open from an earthquake to you, through crust, mantle and core, and sends the P and S waves on their way to you: a teaching model fed by earthquakes from the U.S. Geological Survey. The Around you list ranks what is near your place by how serious it is, from storms and fires to quakes, disaster alerts and aurora, and every entry names where it came from and when that was current. Hurricanes carry the National Hurricane Center's track and cone; aurora carries NOAA's Kp index and your chance of seeing it. Fire points are heat signals picked up from orbit, not confirmed wildfires. Aircraft appear over six cities only (Pune, Tokyo, Sydney, London, New York and Tromso), drawn in the sky as 3D airliners. Before you rely on any of this, read what the app does not do.
The page How many satellites are in orbit? counts only the active satellites in our feed and is rebuilt when new satellite data arrives, and satellites by country ranks the owners of those active satellites as the catalogue records them. The "tracked objects" tile in the app gives a larger number, because it counts everything the feed holds, rocket bodies and debris included.
Using the app costs nothing, and its code is published on GitHub for anyone to read and reuse, under the MIT licence. The data comes from public agencies and projects: CelesTrak for orbits, the U.S. Geological Survey for earthquakes, NOAA for space weather and hurricanes, NASA FIRMS for fires, GDACS for floods and volcanoes, MET Norway for cloud forecasts, adsb.lol for aircraft and The Space Devs for launches. Every card names its source, and the Data status screen tells you how recently each feed was confirmed current. The About page lists every source, and How we know sets out the checks behind the reference pages.