Discover the Wonders of the Night Sky with Mobile Observatory 3 Pro


A new app, Mobile Observatory 3 Pro, is now available on Google Play with many exciting new features, enhanced graphics, and an optimized user interface. If your device runs on Android 7 or later, you can purchase the new app here.



Perfect for Sky Enthusiasts


Mobile Observatory is the ultimate tool for anyone fascinated by the wonders of the sky, from the casual sky gazer to the dedicated amateur astronomer.



Stay Informed About Celestial Events


Do you want to know if the next lunar eclipse is visible from your location? Or when the next bright comet will appear? Would you like to receive notifications on your smartphone when Jupiter and the Moon meet in the sky? If you're eager to identify the blazing bright object in the evening sky or stay updated on celestial events visible from your location, then this app is a must-have!

Key Features of Mobile Observatory 3 Pro



  • Zoomable sky map displaying stars, planets, asteroids, and more (above and below the horizon)

  • Interactive top-down view of the Solar System

  • Live mode: point your device at the sky to get information on what you see

  • Calendar featuring detailed descriptions of celestial events

  • Push celestial events to your phone's calendar and set reminder alarms

  • Rise, set, and transit times for any celestial object

  • Position of any object in the sky (altitude and direction)

  • Twilight times and length of day

  • Bright Star Catalog (~9000 stars) with detailed information

  • Over 400,000 additional stars from the PPM Star Catalog (Android 3.1 or higher required)

  • 2,500 selected NGC objects (galaxies, clusters, etc.)

  • Complete Messier Catalog (110 objects) with images

  • Complete Caldwell Catalog (110 objects) with images

  • Complete Hidden Treasures Catalog (109 objects) with images

  • Meteor streams (begin, maximum, hourly rate, etc.)

  • Lunar and solar eclipses information

  • Lunar librations, ascending node, and maximum declination

  • Bright comets automatically selected according to the date

  • Dwarf planets: the five known dwarf planets

  • Minor planets: bright, near-Earth, trans-Neptune (more than 10,000 in the database)

  • Update database online: download up-to-date orbital elements of comets and minor planets

  • Moon phases and the apparent view of the sun and planets

  • Current image of the Sun and sunspot number

  • Automatically generated visibility reports for any object

  • Simulation of light pollution

  • Intuitive User Interface: quickly find what you are looking for

  • Widget displaying rise & set times of the Sun and Moon

  • Maintain your favorite locations in a list

  • Automatic location determination from the mobile network or GPS

  • Select a location from a built-in database or online via Google Maps

  • 400 observatory locations

  • Choose any time and date

  • Detailed ephemeris and visibility information for all objects

  • Dates of conjunctions between any object and planets or the Moon

  • 3D view of the Moon and the planets

  • Accurate calculations for dates between 1900 and 2100



Get Started Today!


Don't miss out on the opportunity to explore the universe at your fingertips. Download Mobile Observatory 3 Pro now and embark on your astronomical journey!