Mobile Observatory Astronomy

Wolfgang Zima

In-app purchases

About this app

Mobile Observatory 3 Pro: your ultimate sky-watching companion. Discover the celestial wonders from your location with the most comprehensive astronomy app available on Google Play Store. Whether you're a casual sky-gazer or a passionate amateur astronomer, this app is a must-have.

With a live, zoomable sky map, you'll know exactly what sky object you're looking at, and you'll have access to loads of detailed information on stars, planets, deep sky objects, meteor showers, comets, asteroids, lunar and solar eclipses, and more. The app offers a photorealistic display of the night and day sky, with a 3D view of the Solar System. You can also get notifications of current celestial events, push events to your phone's calendar, and set reminders.

With an intuitive interface and loads of widgets, Mobile Observatory 3 Pro is the only app you need to stay up-to-date on all things astronomy.

- 45000 stars plus optionally 2.5 mio stars for download
- Photorealistic display of the night and day sky with correctly illuminated landscape. Its the only app on Android which renders the sky physically correct, taking into account atmospheric scattering. Only the real sky is more beautiful...
- Augumented sky view using your device's camera
- 3D-view of the Solar System
- Cardboard viewing of the night sky or the Solar System in 3D
- Map of the Earth showing day and night
- Lots of great widgets for your home screen
- Daily notifications of current celestial events
- More than 60000 Minor Planets with daily updates of orbital parameters
- More than 1000 Comets with daily updates
- Artificial Satellites including the International Space Station (ISS) and all Starlink satellites
- Live mode (point device on sky and get information on what you see)
- Calendar showing detailed descriptions of celestial events
- Push celestial events to your phone's calendar and set a reminder alarm
- Rise, set, and transit times for any object
- Position of any object in the sky (altitude and direction)
- Twilight times, length of day
- 2500 selected NGC objects (galaxies, clusters, ...)
- Messier Catalog (110 objects) complete with images
- Caldwell Catalog (110 objects) complete with images
- Hidden Treasures Catalog (109 objects) complete with images
- Meteor streams (begin, maximum, hourly rate, ...)
- Lunar and solar eclipses information
- Lunar librations, ascending node, maximum declination
- Moon phases, the apparent view of the sun and planets
- Current image of the Sun and sunspot number
- Automatically generated visibility report for any object
- Simulation of light pollution
- Intuitive User Interface: quickly find what you are looking for
- Widget with rise & set times of the Sun and Moon
- Detailed ephemeris, visibility information of all objects
- Dates of conjunctions between any object with planets or the Moon
- Accurate calculations for dates between 1900 and 2100

Ratings and reviews

I'm sure the developer has been doing his best with the forced updates but I need a working app and I've lost patience with the latest V4 updates which simply don't work on my s22 ultra. (last November update did, in part, restore the sky view but it looks horrible) I've downloaded and installed an APK of V3.3.6 and now have a good looking, fully working app again. I do hope the dev doesn't give up as this was the best star map app by far!

What happened to this once great astronomy app? It used to be my favourite. Now upgraded to new version 4.0.1 and lost the entire list of my previous locations. Even worse: it did not show any stars, planets or deepsky objects anymore! Just found you need to disable Landscape to get those back. It's like I am unknowlingly participating in a very crude Alpha test. This should never have been released like this!

I've used this app since 2019, it has been my favorite above all for over 5yrs. After this last update I'm forcing myself to use it, going to hang on for a while in hopes the bugs will get worked out. "If it ain't broke. Don't fix it!"

What’s new

🚀 Version 4.0.6 Update

✨ NEW: Moon Screen with detailed lunar information and phase visualization
✨ NEW: ISS Screen for tracking the International Space Station
✨ NEW: Sun Screen with real-time solar activity and NASA SDO images
✨ FIX: Satellite magnitudes corrected for accurate ISS visibility predictions
✨ FIX: Location geocoding improved for accurate address lookup
✨ Multiple bug fixes and stability improvements