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Version
v4.7.5
Latest
Size
—
Total
Category
education
Developer
Wolfgang Zima
Views
176
Updated
2026-09-19
Screenshots
Mobile Observatory Mod is an astronomy planning app that helps you prepare for the August 12, 2026 total solar eclipse and other skywatching events. It combines local sky information, terrain-aware calculations, event alerts, and tools for planning an observing session from your location.
For the 2026 eclipse, you can view the eclipse path, local contact times, maximum obscuration, a rendered sky view, safety notes, and calendar actions. The paid version includes the complete astronomy toolkit through a one-time purchase, without a subscription.
Plan Around Your Real Horizon
Mobile Observatory Mod uses NASA SRTM elevation data to create a photorealistic 3D terrain profile for locations around the world. Rather than calculating rise and set times against a flat horizon, it calculates them against the surrounding landscape, which can make a difference when hills or other terrain block your view.
The app also offers solar and lunar eclipse predictions with worldwide visibility maps. You can use these maps alongside local timing details to decide where and when an eclipse can be observed.
Alerts for Astronomical Events
Notifications help you follow events that can be easy to miss during day-to-day planning. You can add relevant events directly to your calendar.
- Aurora alerts notify you when geomagnetic activity rises at your location.
- Solar flare notifications use real-time GOES X-ray satellite data.
- ISS visibility alerts include predicted brightness and trajectory information.
- Daily reminders cover conjunctions, eclipses, and meteor showers.
Build an Observing Plan
The Observing Plan Generator creates target lists based on the equipment you use, whether that is the naked eye, binoculars, or a telescope. It also considers your location, date, light-pollution level, and minimum altitude, then generates objects that fit those settings for the night.
For telescope users, Mobile Observatory Mod can connect to computerized telescopes through LX200, NexStar, or INDI. You can browse objects in the app and send GoTo commands, with telescope control connected to the observing-plan workflow.
Sky Views and Astronomy Catalogs
The photorealistic sky view includes 45,000 stars, expanding to 2.5 million stars after the additional download. An augmented reality mode places a live camera overlay over the sky view, while the interactive 3D Solar System also supports VR/Cardboard viewing.
- Deep-sky catalogs include Messier, NGC, Caldwell, and Hidden Treasures objects.
- Galilean moon positions and Saturn moon tracking help you follow these planetary systems.
- A live space-weather dashboard includes an aurora forecast.
- Home-screen widgets and night mode support regular use and low-light observing.
What’s New
v4.7.5Version 4.7.5
🔧 Bug fixes and stability improvements.
Release notes published by the developer on Google Play.View on Google PlayRetrieved 2026-09-20
Verified package facts
These values are read from the installable file and cross-checked against the app's Google Play listing. JoJoy does not run antivirus scans and does not test each build on physical devices.
Data Safety
Published by Mobile Observatory’s developer on Google Play. It describes what the official app collects and shares, reproduced here so you can review it before installing.
- Data is encrypted in transitYour data is transferred over a secure connection
- Data can’t be deletedThe developer doesn’t provide a way for you to request that your data be deleted
- Committed to follow the Play Families PolicyThe developer has committed to follow the Play Families Policy for this app.
Data this app may collect
- App info and performance
- Crash logsAnalytics
- DiagnosticsOptionalAnalytics
View on Google PlayRetrieved 2026-09-20
Mod Review
This build suits observers planning the August 12, 2026 eclipse or setting up regular sessions around local terrain and object altitude. It also fits telescope owners whose equipment uses LX200, NexStar, or INDI connections. Users who prefer not to share crash logs and diagnostics may want to skip it. It requires Android 8.0 or later, so older devices are not eligible.
What the mod changes
This is the standard build of Mobile Observatory Mod. The app is available on Google Play as a paid product, priced at 11.99 EUR. Its version is 4.7.5, which includes bug fixes and stability improvements. The astronomy tools, alerts, planning functions, and telescope support remain part of the same Mobile Observatory Mod experience.
Pros
- Terrain-based horizon calculations help you assess rise and set times against the landscape at your chosen location.
- The Observing Plan Generator filters targets by equipment, light pollution, date, location, and minimum altitude.
- ISS alerts include predicted brightness and trajectory, giving you practical details before a visible pass.
- LX200, NexStar, and INDI support lets compatible telescope users send GoTo commands from the object browser.
Cons
- Google Play lists crash logs and diagnostics among the data collected by the app.
- The app needs Android 8.0 as a minimum requirement, limiting installation on older Android devices.
- Version 4.7.5 only notes bug fixes and stability improvements, without identifying individual corrected issues.
Verdict
Install it when you need terrain-aware eclipse planning, event alerts, or a structured observing list for your available equipment. Before installing, check that your device runs Android 8.0 or later and consider the listed diagnostic data collection.
FAQ
How can Mobile Observatory help with the August 12, 2026 eclipse?
Mobile Observatory shows the eclipse path, local contact times, maximum obscuration, and a rendered sky view for your location. It also includes safety notes and calendar actions to help organize the event.
How does the Observing Plan Generator choose targets?
The generator uses your equipment type, location, date, light-pollution level, and minimum altitude. It can create a target list for naked-eye viewing, binoculars, or a telescope.
Can Mobile Observatory control a computerized telescope?
Yes. It supports connections through LX200, NexStar, and INDI protocols. You can browse objects in the app and send GoTo commands to a compatible telescope.
What does this build change?
This is the standard build of Mobile Observatory. It is version 4.7.5, and its release notes mention bug fixes and stability improvements.
What Android version does Mobile Observatory require?
Mobile Observatory requires Android 8.0 or later as a minimum requirement. Google Play lists crash logs and diagnostics as data collected by the app.