Mobile Observatory Astronomy Mod APK v4.7.5 [Unlocked,Premium]

v4.7.5 2026-09-19

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Free astronomy app with sky map and optional Premium.

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App Info

App Name

Mobile Observatory Astronomy

Version

4.7.5

Updated

2026-09-19

Publisher

Wolfgang Zima

Requirements

Android 7.0+

Screenshots

MOD Info

1 . Premium Features Unlocked

Note: Requires an internet connection for some features and may need additional storage space.

Description

Mobile Observatory Astronomy is the free version of Mobile Observatory, giving you an easy way to start with the sky map, rise and set times, Moon phases, and basic object data. Upgrade to Premium anytime to unlock the complete astronomy toolkit. If you already bought Mobile Observatory Pro version 3 or later, you do not need to pay again—just open or reinstall Mobile Obs Pro Astronomy with the same Google account. Both apps provide the same full experience after unlocking, with accurate horizon-based observing, eclipse data, alerts, planning tools, and telescope control for serious skywatchers everywhere.

Real Horizon Accuracy

Unlike apps that rely on a flat horizon, Mobile Observatory uses NASA SRTM elevation data to build a realistic terrain profile for your exact location. That means rise and set times are calculated against your actual landscape, helping you plan with greater confidence.

Photorealistic 3D horizon view
Location-based rise and set calculations
Ideal for astrophotography and precise observation

Stay Ahead of the Sky

Never miss important astronomical activity with alerts and reminders designed for active observers. From auroras and solar flares to ISS passes and daily celestial events, the app keeps you informed in real time.

Aurora alerts based on geomagnetic activity
GOES solar flare notifications
ISS visibility predictions
Event reminders for eclipses, conjunctions, and meteor showers

Plan Better Observations

The built-in Observing Plan Generator helps you create personalized target lists based on your equipment, location, date, light pollution, and minimum altitude. Whether you observe with the naked eye, binoculars, or a telescope, it can suggest the best objects for the night.

Customized observing lists
Supports multiple equipment types
One-tap target planning for beginners and experts

Advanced Tools for Serious Stargazers

When unlocked, Mobile Observatory offers a full set of advanced astronomy tools, including deep sky catalogs, telescope control, eclipse maps, and rich sky visualization. It is built for users who want both convenience and depth in one app.

Deep sky catalogs such as Messier, NGC, and Caldwell
LX200, NexStar, and INDI telescope support
AR mode, 3D Solar System, and VR/Cardboard support
Worldwide eclipse prediction and visibility maps

Free to Try, Easy to Upgrade

Start for free with the essential astronomy features and upgrade to Premium whenever you want the complete toolkit. Trusted by astronomers, astrophotographers, and stargazers since 2011, Mobile Observatory continues to evolve with fresh data and useful features.

Security Report

Mobile Observatory Astronomy Mod APK

4.7.5

We take security seriously. Our team has thoroughly analyzed this APK to ensure it is free from malware, viruses, and other malicious code. The app has been verified using industry-standard tools and techniques, and we have confirmed that it is safe to install on your Android device.

- Is safe to download apps and games on ACMarket? - You can also verify it on Virustotal.

FAQ

How do I calibrate the compass and gyroscope in Mobile Observatory Astronomy?

To calibrate the compass and gyroscope, open your device’s sensor settings and follow the on-screen calibration prompts in the app. For best accuracy, move away from magnets, metal objects, and electronic interference. If readings still seem off, restart the app and recalibrate in an open outdoor area.

Why are the sky map and object positions not matching what I see in the sky?

Please make sure your location services are enabled and that the app has permission to access your location. Also check that the correct date, time, and time zone are set on your device. A mismatched time zone or inaccurate GPS signal can cause object positions to appear incorrect.

Can I use Mobile Observatory Astronomy offline?

Yes, many core features can work offline once the app has loaded the necessary data. However, some functions such as location-based updates, cloud syncing, or online content may require an internet connection.

How do I search for a planet, star, or constellation?

Tap the search icon in the app and enter the name of the object you want to find. You can search by common names or catalog names, depending on the object. After selecting a result, the app will guide you to its position in the sky.

The app is crashing or not opening. What should I do?

First, make sure you are using the latest version of the app and that your device meets the minimum system requirements. Try restarting your device, clearing the app cache, or reinstalling the app if needed. If the issue continues, contact support with your device model and OS version.

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