Your Complete Android Observatory
Available in English, Deutsch, Français, Italiano & Español
See Mobile Observatory in action
Twilight Sky
Day/Night on Earth
Solar Eclipses
Tonight in the Sky
3D Solar System
Orion Nebula
Live Solar Images
Know exactly when celestial objects become visible from your location
Calculate precise horizon profiles using NASA SRTM elevation data. See exactly where mountains, hills, and terrain block your view of the sky from your observing location.
The only astronomy app with real horizon data
An astronomy app first - know when objects clear your hills
Smart push notifications keep you informed
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
Start with Mobile Observatory Freemium, then unlock the complete observatory
Explore the Night Sky
Try Mobile Observatory Freemium
Your Complete Observatory
Get Full Observatory
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!"
Latest updates and improvements
Start with the free Sky View or get the complete observatory experience.
The story behind Mobile Observatory
Creator of Mobile Observatory
The developer of Mobile Observatory, Wolfgang Zima, spent years as a professional astronomer before transitioning to software development. After completing his PhD in Astronomy at the University of Vienna, he moved to Belgium to work as a postdoctoral researcher at the Institute for Astronomy at KU Leuven for five years. There, he discovered his passion for scientific software development, creating tools for analyzing spectra of pulsating stars and building a CCD image simulator for a space mission searching for exoplanets.
The story of Mobile Observatory began unexpectedly: after his Nokia phone broke during a mountain biking trip in late 2010, Wolfgang bought his first Android phone and was surprised to find no quality astronomy apps available. He decided to build one himself. Mobile Observatory was first released in January 2011 and 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+ downloads of the Pro version — continuously improved over more than a decade.
Since 2012, Wolfgang has called Freiburg, Germany home. Today, he works as a Senior Mobile Developer at sevdesk while continuing to develop Mobile Observatory with the same passion as day one — now with the help of modern AI tools that allow him to bring new features to life faster than ever before.