Mobile Observatory Free - Astronomy app icon

Mobile Observatory Free - Astronomy

Your resource for stars, planets, the Sun, the Moon, and astronomical events

Wolfgang Zima · com.zima.mobileobservatoryfree

5.0 out of 5 (1 rating) 500K+ downloads v3.3.3 48.3 MB Android 7.0+ PEGI 3 · Everyone

  • Signature matches the Google Play version Details

At a glance

Latest version
v3.3.3 (557)
Updated
Dec 26, 2025 (9 months ago)
APK size
48.3 MB
Requires
Android 7.0+ (API 24)
CPU support
Any (no native code)
Graphics
OpenGL ES 2.0+
Category
Education (app)
Listed since
Jul 6, 2021 (at least)
Permissions
12 (4 sensitive)
Website
mobileobservatory.info
Developer contact
[email protected]
Privacy
Developer's privacy policy

About this APK

Mobile Observatory Free - Astronomy is an app by Wolfgang Zima in the Education category, listed since at least July 2021. It has no native code, so it runs on any Android processor.

It asks for 12 permissions, 4 of them sensitive, including precise location, record audio and approximate location. The app offers in-app purchases through Google Play.

What's new in v3.3.3

Major Update: Now equivalent to the latest version of Mobile Observatory Pro, except for the advertisements. Improved layout, many bugs corrected and several new features Current catalogues of artificial satellites, minor planets, and comets can now be downloaded after watching a video ad (unlock is valid for two days)

Description

From the listing uploaded by “appupdater”.

Mobile Observatory Free is the perfect tool for anybody interested in the sky's wonders, from the occasional sky gazer to the passionate amateur astronomer. If you want the ad-free version, please visit https://play.google.com/store/apps/details?id=com.zima.mobileobservatorypro 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, 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! Mobile Observatory Free is the free version of the successful astronomy app Mobile Observatory Pro, which is available for purchase on Google Play. The key features of MO Free are as follows: - Photo-realistic 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... - 30.000 stars to magnitude 7 - 3D-view of the Solar System - Automatically created calendar of celestial events - Map of the Earth showing day and night - Automatic calculation of interesting celestial events for your location - Daily notifications of current celestial events - 1000 minor planets - All 88 constellations - Messier and Caldwell catalogs (220 Deep Sky objects) - ... and much much more... Mobile Observatory displays the current view of the sky, the times of rise and set of any object, current positions, and apparent views of the planets, twilight times, moon phases, celestial events (such as conjunctions and eclipses), a 3D-view of the Solar System and much more. Use Live Mode to point your device to the sky and find out what you are looking at using the orientation sensors or get daily notifications of celestial events. Mobile Observatory currently includes data for the Sun, Moon, seven planets + Pluto, a built-in star catalog of more than 30000 stars (to magnitude 7), the Messier catalog (110 objects), and the Caldwell catalog (110 objects). The orientation sensors of your device can be used to use Mobile Observatory as a guide to the sky via Live Mode.

Security & authenticity

Security rating: Trusted

Signing certificate

  • Signature matches the Google Play version Checked by the source store on Dec 26, 2025.
  • Certificate from Google Play App Signing Google keeps the signing key for the developer, so the certificate carries Google's name.

Store checks and file details

  • Developer signature verified Dec 26, 2025
  • Validated against Google Play Dec 26, 2025
  • Signed byCN=Android, OU=Android, O=Google Inc., L=Mountain View, ST=California, C=US
  • Signing certificate (SHA-1)11:3D:F2:26:17:F5:A9:CA:74:8C:B1:85:B4:96:01:A5:30:AC:CB:57
  • File MD536d6fc9dd51beeb5820bf5059e25f55e
  • Uploaded by “appupdater” Gold tier · 117,810 followers · uploading since 2020

Scans and ratings come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures. AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.

Permissions (12)

Mobile Observatory Free - Astronomy requests 12 permissions, 4 of them sensitive.

Required hardware & features

Mobile Observatory Free - Astronomy APK: questions and answers

Can I install this APK over the version I already have?

Yes, if your installed copy is older. It is signed like the Google Play version, so Android installs it as an update and keeps your data.

Is Mobile Observatory Free - Astronomy free?

The APK is free to download, but the app offers in-app purchases through Google Play.

Is the Mobile Observatory Free - Astronomy APK safe?

No one can promise that a file is safe, but some things can be checked. The source store rates this file Trusted. Its signature matches the Google Play version. After downloading, check that the file's MD5 is 36d6fc9dd51beeb5820bf5059e25f55e.

Tags

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