A planetarium that knows where you stand
Real astronomy under the hood, a single glowing arrow on top. Everything is computed on-device from your GPS position and the clock.
Augmented-reality pointing
Hold your phone to the sky and the compass + gyroscope become a camera. Tilt and turn — the sky moves with you in true AR.
Live, real positions
Sun, Moon, the naked-eye planets, constellations, bright named stars and deep-sky gems — nebulae, clusters and galaxies — all placed from your location and the current moment.
Finger-drag manual mode
No clear sky or stuck indoors? Drag with a finger to pan the sky and explore exactly where each object sits right now.
Tonight at a glance
A nightly digest: the dark-sky window, which planets are up west-to-east, the Moon, and the best naked-eye target for tonight.
The Moon, in detail
Tonight's phase as a real lunar photo, the Moon's age and distance on a perigee-to-apogee scale, the next full moon with its traditional name, and the constellation it's crossing.
Meteor showers & conjunctions
The next meteor shower — peak night, best viewing window, radiant and how bright the Moon will be — plus a heads-up when two planets draw close together.
See the sky from any city
Travelling, or just curious? Jump to any major city — or the poles, Mauna Kea, the Atacama — and the whole sky and the local time shift to that spot.
One-year sky tracks
Toggle a 12-month trail for any object: the Sun's analemma, a planet's retrograde loop, or a constellation's seasonal drift.
Five languages
Persian, English, Russian, Turkish and German — with a Jalali or Gregorian calendar and a red night-vision mode.
Follow Ursa Minor around the pole
The Little Dipper is the perfect first target — Polaris at the tip of its handle barely moves all night while the rest of the sky wheels around it. Turn on the one-year track and watch how the whole constellation pivots about the celestial pole. It's the clearest way to see the Earth turning.
From "where is it?" to "there it is"
No setup, no charts to read. Open the link and you're under the sky.
Pick an object
Open the picker and choose the Moon, Sun, a planet, or a constellation. The "visible tonight" filter shows only what's above your horizon.
Hold up your phone
Tap Start to enable the compass. Raise the phone toward the sky — the live view tracks wherever you aim it.
Follow the arrow
A golden arrow points to your target — even below the horizon. Centre it in the reticle and you're looking right at it.
Built for a dark sky
A calm, high-contrast interface that stays readable when your eyes are dark-adapted.
Frequently asked
Do I need to install anything?+
No. Aseman is a web app — tap Launch app and it opens in your phone's browser. There's nothing to download and no account to create. You can add it to your home screen if you like.
Why does it ask for location and motion access?+
Your location and the current time are what let it compute exactly where each object is in your sky. The compass and gyroscope let the phone act as a camera so the arrow points the right way. The sky is computed entirely on your device — your location isn't sent anywhere for that. We do use privacy-friendly analytics (Google Analytics) to count which features are used, which you can decline; no personal data is sold.
The "hold to sky" mode isn't working — why?+
Device sensors need a secure connection (HTTPS) and, on iPhone, a tap on the Start button to grant motion permission. If sensors are unavailable, the app falls back to finger-drag manual mode so you can still explore the sky.
Can I explore the sky from another place?+
Yes. Tap your location at the top and pick any major city — or a pole, or a famous observatory like Mauna Kea. Aseman shows that spot's sky and switches the clock, rise/set times and "tonight" to its local time — handy for trip planning or just curiosity.
How accurate are the positions?+
Plenty accurate for finding things by eye: the Sun and Moon to about an arc-minute, planets to within a fraction of a degree. The limiting factor is usually your phone's compass, not the math.
Is it free?+
Yes — completely free, no ads, no sign-up.
The sky is up there right now.
Open Aseman, hold up your phone, and follow the arrow to your first target.
Launch the app →