Mobile Observatory 3 Pro - Astronomy

In-app purchases
4.25K reviews
Content rating
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About this app

Mobile Observatory 3 Pro is the perfect tool for anybody interested in the sky's wonders, from the occasional sky gazer to the passionate amateur astronomer.

Do you want to know if the next lunar eclipse is visible from your location or when the next bright comet is visible? Would you like to be notified by your smart phone next time, Jupiter and the Moon meet in the sky? Do you want to know what the blazing bright object in the evening sky is? Do you want to be always up-to-date which celestial events that are visible from your location? Then this app is a must-have for you!

Mobile Observatory does not only include a live, zoomable sky map which tells you what sky object you are looking at but provides you with loads of detailed extra information on stars, planets, deep sky objects, meteor showers, comets, asteroids, lunar and solar eclipses as well as detailed ephemeris of all included sky objects and an interactive top-down view of the Solar System. All that in just one app!

- 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
Updated on
Jul 20, 2021

Data safety

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4.25K reviews
Zach Rutledge
October 6, 2021
There's just so much data at your fingertips here. That's both a good thing and a bad thing, because while it has every bit of astronomical information you could possibly ask for, it makes for navigating and accessing things really difficult. There's just SO much info, and so many categories and things to look at, it can be hard to drill down to a specific type of data. I like the daily notification of events, but I wish the satellite database could auto update itself in the background once every few weeks instead of requiring me to use the app.
25 people found this review helpful
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A Google user
June 19, 2019
Best astronomy app for Android, by far. Excellently and meticulously designed, yet very intuitive. It works well for the amateur as well as the well-seasoned astronomer. It beats even all the much more expensive ones. The Event notifications alone are amazing but I love every other feature it has. Not to mention, it is beautiful to look at. The developers went all the way, no holds barred, on this. Thank you for such a great app.
21 people found this review helpful
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Andrew Selden
September 12, 2020
Many functions (I haven't explored all of them). Clear display with smooth movement/animation. Helpful tips. Only thing that comes close to a fault is that it has to load data every time it boots, but it doesn't take more than about 7 seconds over WiFi. And there are settings that allow you to download many of them preemptively. Not sure how fast the boot/load would go over 4G
6 people found this review helpful
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What's new

Several bugs corrected