Live Earth & sky,
on your wrist.
Planetaria for Wear OS is the desk globe's little sibling: the same live planet, computed on a watch. The day/night line falls where the Sun really is, with the season. The Earth is today's NASA satellite pass. Earthquakes pulse at their epicentres, the ISS crosses on its real orbit, and city lights come on where night has fallen. Swipe sideways for the Moon, the Sun and every planet; swipe up for tonight's sky.
See it move
Forty seconds on the watch: the Earth turning through its day, a month of the Moon, tonight's sky, today's Sun, the planets, and the Tonight card. Every frame was recorded from the app running on a Galaxy Watch 7.
Computed minute by minute
Every frame comes from the real world: the Sun's position for this exact minute and season, today's NASA satellite imagery, live USGS and NOAA feeds. Set Motion to time-lapse and watch a whole day of daylight sweep the planet in a minute.
The real day & night
The terminator is placed astronomically, with a soft twilight band where dusk is falling right now. The day side is today's NASA VIIRS true-colour Earth; the night side glows with real city lights.
A living planet, centred on you
Recent magnitude-4.5+ earthquakes pulse at their epicentres, the ISS crosses on its real orbit, and NOAA's aurora forecast glows over the night side. Flip one setting and your home sits at the centre of the disc.
Every world, lit by its own Sun
Swipe sideways through the worlds: Earth, the Moon, tonight's sky, the Sun, and Mercury to Neptune. Each planet is placed by verified ephemerides and lit from its real pole and season, so Uranus is lit from its pole and Saturn wears its rings. Turn the shadows off any time to see the whole surface.
Saturn, with its rings
The rings are drawn from NASA Cassini measurements of their real structure: the C and B rings, the Cassini Division, the A ring and the Encke gap. Saturn's Sun lights them; the planet's shadow falls across them on the night side, and theirs falls on the planet.
The planets, as they are today
Jupiter's bands, the rust of Mars, the clouds of Venus: every planet in real imagery, framed to show its day and its night, from the same engine that drives the globe.
The living Moon
The Moon view is the Moon as it hangs in the sky tonight, with the same physics as our Lunaria desk display. It rocks and nods with its real monthly libration, the dark side glows with earthshine near new Moon, and the disc grows about 7% toward perigee. Set Moon motion to play a whole month in ten minutes or in fifty seconds.
Tonight's Moon, or any night
A Moon keepsake freezes the view to a night that matters, back to 1900: that night's exact phase, libration and size, kept on the watch.
The blood Moon, on cue
Planetaria predicts every solar and lunar eclipse on the watch and, on the night, renders the Moon reddening as it slides into Earth's shadow: the light of every sunset on Earth at once.
Tonight, at a glance
Swipe up for the one thing in tonight's sky worth walking outside for: an eclipse, a meteor shower at its peak, two bright planets close together, a full Moon rising, golden hour or a visible ISS pass, with the next pass, the planets that are up and the Moon beneath it.
The sky, watched for you
The same highlight leads the Sky Now tile and a complication. Optional alerts arrive only when the sky earns them: a genuinely visible ISS pass, aurora likely near you, an eclipse on its way, a meteor shower at its peak.
The real Sun, sunspots and all
The Sun view is NASA's latest image of the photosphere, refreshed hourly. The night-sky view maps the constellations and planets above you, with meteor radiants when a shower peaks.
Nine complications for any watch face: Tonight, moon phase, moonrise and moonset, sunrise and sunset, golden hour, next tide, next ISS pass, aurora chance and the next eclipse. Two tiles: Sky Now and a live globe centred on you.
Yours to set up
The tide, at a glance
Swipe down from any world for a tide dial from the nearest NOAA station: the height now, rising or falling, and the curve of the day.
Tonight's constellations
A planisphere of the stars and planets over your location, turning with the Earth, with each meteor shower's radiant marked at its peak.
The desk globe's options came along: time-lapse motion and Moon motion, globe centre on the day/night line or on you, view tilt, Earth and planet shadows, layers for clouds, city lights, the ISS, earthquakes and aurora, brightness and auto-dim at night. Keep time on puts the native Wear OS clock along the top of every view.
Built like an instrument
On-device astronomy
The Sun, Moon and planets are computed on the watch and checked against NASA JPL Horizons: Earth's day/night line to within a hundredth of a degree.
Offline-first, forever
Lose the network and the astronomy keeps running: globe, terminator, Moon, planets, night sky. Live layers keep their last good data, show its age, and catch up when you reconnect.
Battery discipline
In real time the globe redraws on a slow tick and dims instantly in ambient mode. Time-lapse runs only when you choose it, and live data arrives on a gentle schedule.
App specifications
| Platform | Wear OS 3 or newer, standalone; no phone app required. Tested on a Galaxy Watch 7 |
| Rendering | Per-pixel spherical renderer ported from the desk globe's firmware: today's NASA VIIRS true-colour Earth, city lights, each world's real terminator, Saturn's rings from Cassini data; time-lapse at 25 frames a second |
| Views | Side to side: Earth (clouds, quakes, ISS, aurora) · the living Moon · night-sky planisphere · live Sun (NASA SDO) · Mercury–Neptune. Down: NOAA tide dial. Up: Tonight, Settings, About |
| Sky events | Eclipse prediction and rendering on the watch · aurora forecast (NOAA OVATION) · meteor showers · the Tonight highlight · optional ISS, aurora, eclipse and meteor alerts |
| Tiles & complications | Sky Now tile · live globe tile centred on you · nine complications: Tonight, moon phase, moonrise/moonset, sunrise/sunset, golden hour, tide, ISS pass, aurora chance, next eclipse |
| Accuracy | Sun, Moon and planet positions and lighting checked against NASA JPL Horizons; Moon model shared with the Lunaria desk display |
| Data sources | NASA GIBS/VIIRS and SDO imagery · NASA PDS Cassini ring profile · MET Norway weather · USGS earthquakes · NOAA tides and aurora · ISS orbit from CelesTrak and wheretheiss.at; all keyless, aggregated by a free edge worker |
| Built to last | The live layers stand on public data services, including the ISS orbit from CelesTrak and wheretheiss.at, independently run sources we name openly. The app is engineered for that dependency, in three steps. Fresh: every feed is fetched from more than one path, including straight from the agencies with no server of ours in between. Paused: the last good data is kept and its age shown rather than guessed. Ended: should a source ever go away for good, that one layer simply rests: the ISS marker steps aside, alerts speak only from fresh data, and everything around it is untouched. The astronomy itself (globe, Moon, Sun, planets, eclipses, meteor showers, the night sky) is computed on the watch and is yours for as long as the watch runs. |
| Settings | Motion time-lapse and Moon motion · globe centre · view tilt · Earth and planet shadows · layer toggles · keep time on · time & weather · brightness · auto-dim · °C/°F · Moon keepsake |
| Privacy | No account, no ads, no analytics. Location stays on the watch except rounded coordinates used to fetch your weather and tides; full privacy policy |
| Price | $2.99 at launch, one purchase. No subscription. In closed beta on Google Play now |