Your Complete Android Observatory
Everything you need for astronomy, in your pocket
Point your phone and identify stars, planets, and constellations live
Explore planets, moons, and comets in an interactive orrery
ISS passes, Starlink trains, and 10,000+ satellites in real-time
2,500+ nebulae, galaxies, and star clusters with photos and details
50+ event types including eclipses, conjunctions, occultations, transits, and more
Aurora alerts, solar flares, ISS passes, and event reminders
Aurora forecast, Kp-index, solar flares, and NASA SDO images
Phases, eclipses, lunar features, sunspot data, and rise/set times
Real terrain profiles from NASA data for precise rise/set times
Auto-generated session plans based on your equipment and location
Connect your GoTo telescope and slew to any object with a single tap
Hipparcos, SAO, and extended catalogs with detailed star data
Free download with optional Pro upgrade
See Mobile Observatory in action
Sky View — Moon & Jupiter over the real horizon with constellation lines and Milky Way
Popular Objects — See at a glance which planets, stars, and deep sky objects are visible tonight
Upcoming Events — Never miss a conjunction, eclipse, meteor shower, or planetary opposition
Deep Sky — Browse nebulae and star clusters with a camera/telescope field-of-view frame overlay
Sun's Daily Path — Track the Sun's arc across the sky over your real topographic horizon throughout the day
Observing Planner — Auto-generate optimized observation lists for your location and equipment
Telescope Control — Point your GoTo telescope at any object directly from the app via INDI protocol
3D Solar System — Explore planets, dwarf planets, and comets in an interactive 3D orrery
Sun & Solar Activity — Live sunspot map, solar cycle tracking, and aurora forecast
Moon — Detailed lunar phase, libration, terrain features, and next eclipse info
Star Details — In-depth data for every star including variability, spectral class, and visibility
From first launch to expert observer
Point your phone at the sky and see stars, planets, and the Sun's path over your real 3D terrain.
Browse upcoming conjunctions, eclipses, ISS passes, and thousands of celestial objects with detailed data.
Generate optimized observing plans, control your telescope, and log your observations like a pro.
Start exploring tonight
Scroll through real app screens — tap to enlarge
Whether you're observing deep sky objects, planning an astrophoto shoot, or chasing the perfect Milky Way rise — these tools help you get the shot and the view
Planisphere — Full 360° sky with your real 3D topographic horizon
Sun's Daily Path — Track the Sun's arc over your actual terrain
Moon Tracking — Watch the Moon rise over mountains with time markers
Rise & Set Times — Terrain-corrected times for every celestial object
The only astronomy app that knows what your actual horizon looks like. Know exactly where and when the Moon, Sun, or Milky Way will rise behind the mountains — perfect for planning landscape astrophotography.
Daily Events — Get notified about tonight's eclipses, conjunctions, meteor showers, and more
ISS Passes — Never miss a visible pass of the International Space Station over your location
Aurora Alerts — Get notified when the Kp-index rises or aurora becomes visible at your latitude
Solar Flares — Receive alerts for M-class and X-class solar flares that affect space weather
Never miss an astronomical event again. Mobile Observatory watches the sky for you and sends personalized alerts based on your location and interests.
Session Setup — Pick your date and choose evening, full night, or morning
Object Types — Recommended Mix, Planets, Messier, Deep Sky Tour, or custom
Conditions & Equipment — Select your gear, horizon model, and target count
Your Plan — 20 optimized targets with visibility, altitude, and full-night coverage
Get a personalized, guided list of the best objects to observe tonight based on your location, equipment, and sky conditions.
Connect and control your computerized telescope directly from the app. Slew to any object with a single tap.
FOV Frame — Configure your telescope, eyepiece, or camera directly in the Sky View
Live Overlay — See your exact field of view around the Moon or any object
Eyepiece View — Realistic simulation of what you'll see through your eyepiece
Camera Sensor — Preview your astrophotography framing with accurate star fields
Long Exposure — Simulate star trails and deep sky captures before shooting
Frame your shot before you set up. See exactly how any object will look through your telescope or camera lens — ideal for planning astrophotography compositions.
Tools for astronomers, astrophotographers, and anyone who looks up
Explore the solar system in an interactive 3D view
Track the ISS, Starlink, and thousands more
Point your camera and explore the sky
Real-time aurora and solar activity dashboard
Personalized recommendations for your location
Massive astronomical database at your fingertips
Plan your observing sessions in advance
Detailed Sun and Moon information
Download Mobile Observatory for free and upgrade when you're ready
Free Download — Upgrade to Unlock Everything
Download Free — Upgrade via Subscription or One-Time Purchase
Already sure? Get everything permanently
One-time purchase, lifetime access
Trusted by astronomy enthusiasts worldwide
"This app is simply fantastic and keeps getting better. It offers a huge variety of features, making it the most professional app in the Play Store."
"A fantastic update. I have always found this app excellent, and now it is even better."
"Version 4 is amazing: intelligently programmed, very well organized. Thank you for this excellent work!"
"Along with Stellarium and SkySafari, this is one of the best astronomy programs!"
Join 200,000+ astronomy enthusiasts
The story behind Mobile Observatory
Creator of Mobile Observatory
Wolfgang Zima spent years as a professional astronomer before finding his way into software development. After completing his PhD in Astronomy at the University of Vienna, he worked as a postdoctoral researcher at the Institute for Astronomy at KU Leuven in Belgium for five years. It was there that he discovered a passion for scientific software — writing tools for analyzing spectra of pulsating stars and building a CCD image simulator for ESA's PLATO mission, a space telescope searching for Earth-like exoplanets.
Mobile Observatory started almost by accident: when his Nokia phone broke on a mountain biking trip in late 2010, Wolfgang got his first Android phone and was surprised that no good astronomy apps existed. So he built one. First released in January 2011, Mobile Observatory has since grown into one of the most comprehensive astronomy apps for Android — with over 1 million downloads of the free version and 250,000+ of the Pro version — and has been continuously improved for well over a decade.
Wolfgang lives in Freiburg, Germany, where he works as a Senior Mobile Developer at sevdesk. He continues to develop Mobile Observatory with the same enthusiasm as on day one — now with the help of modern AI tools that let him bring new features to life faster than ever.
Latest updates and improvements
Thank you for your valuable feedback! Many of your reported issues and improvement suggestions are being worked on — and some are already included in this release.
Preview screenshots:
Lunar Eclipse — Shadow Diagram & Contact Times
Lunar Landings — Historic Moon Landing Sites
Asterisms — 31 Informal Star Patterns
Feature screenshots:
Telescope Control
Draw Your Horizon
Saved Scenes
Observing Plans
My Observations
Log Observation
My Equipment
Edit Telescope
FOV Calculator
FOV Simulator
FOV Frame in Sky View
Optical Tools
Notifications
Observing Plan Generator
3D Topographic Landscape
Double Star Map
Variable Star Light Curve
Eclipsing Binary Predictions
Comet Light Curve
Selenographic Feature Map
Lunar Feature Detail
Lunar Terminator Table
Long Exposure Simulation
Start with the free Sky View or get the complete observatory experience.