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Version
v4.7.5
Latest
Size
—
Total
Category
education
Developer
Wolfgang Zima
Views
161
Updated
2026-09-19
Screenshots
Mobile Observatory Mod is an astronomy app that helps you plan observations, follow sky events, and prepare for the August 12, 2026 total solar eclipse. It combines local eclipse information, a rendered sky view, astronomical catalogs, observing tools, and telescope control in one paid version.
The app is the classic paid edition of Mobile Observatory Mod. One purchase provides the complete toolkit without a subscription, and you can reinstall it with the same Google account if you already bought it.
Plan the August 12, 2026 Total Solar Eclipse
For your location, Mobile Observatory Mod shows the eclipse path, local contact times, maximum obscuration, a rendered view of the sky, safety notes, and calendar actions. These details help you organize when and where to observe the event.
Use a Real Topographic Horizon
Instead of assuming a flat horizon, the app downloads NASA SRTM elevation data and renders a 3D terrain profile for locations around the world. Rise and set times are calculated against the local landscape, which supports more precise planning for observers and astrophotographers.
Receive Astronomical Event Alerts
Mobile Observatory Mod can notify you about several types of sky activity and add events directly to your calendar.
- Aurora alerts indicate when geomagnetic activity increases at your location.
- Solar flare notifications use real-time GOES X-ray satellite data.
- ISS alerts include visibility information, brightness, and trajectory predictions.
- Daily reminders cover conjunctions, eclipses, and meteor showers.
- Calendar actions let you send events to your device calendar.
Create an Observing Plan
The Observing Plan Generator creates target lists using your equipment, location, date, light pollution level, and minimum altitude. You can choose naked-eye observing, binoculars, or a telescope, then generate suitable objects for the night.
Control a Computerized Telescope
You can connect a computerized telescope through LX200, NexStar, or INDI protocols. After browsing objects in the app, you can send GoTo commands, and the telescope function works with the Observing Plan Generator.
Explore the Sky and Solar System
The photorealistic sky view includes 45,000 stars, or 2.5 million stars after the available download. The app also provides augmented reality with a live camera overlay, an interactive 3D Solar System, and VR or Cardboard support.
- Deep-sky catalogs include Messier, NGC, Caldwell, and Hidden Treasures.
- Solar and lunar eclipse predictions include worldwide visibility maps.
- Galilean moon positions and Saturn moon tracking help you follow planetary systems.
- A live space weather dashboard includes an aurora forecast.
- Home screen widgets and night mode support regular use and dark observing conditions.
Paid Version and Access
Mobile Observatory Mod includes satellite tracking, deep-sky catalogs, push notifications, telescope control, and the Observing Plan Generator in the paid version. Access is provided through a one-time purchase rather than a subscription, while Mobile Observatory Mod Astronomy is available separately as a free version with an optional Premium upgrade.
- Version 4.7.5🔧 Bug fixes and stability improvements.
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 preparing for the August 12, 2026 eclipse because it provides local contact times, visibility information, and safety notes. It also fits users who need a topographic horizon rather than a flat-horizon estimate. You should skip it if collected crash logs and diagnostics are a concern, since those data types are listed by Google Play. The release notes only mention bug fixes and stability improvements, so they do not establish a new astronomy capability.
What the mod changes
The supplied label identifies this build as Version 4.7.5 with bug fixes and stability improvements. It does not state that a specific premium feature, purchase, or restriction is unlocked beyond the paid product description. The astronomy tools, telescope protocols, alerts, and observing planner remain the capabilities described for Mobile Observatory Mod itself. Because Google Play also lists version 4.7.5, check the build details if you expect a difference from the store release.
Pros
- The topographic horizon uses NASA SRTM elevation data, making rise and set planning location-specific.
- The Observing Plan Generator considers equipment, light pollution, altitude, date, and location when creating targets.
- Telescope control supports LX200, NexStar, and INDI protocols for sending GoTo commands.
- Eclipse maps, ISS predictions, aurora alerts, and calendar actions bring several planning tasks together.
Cons
- Google Play lists crash logs and diagnostics among the data types collected by the app.
- The minimum requirement is Android 8.0, which excludes devices running earlier Android versions.
- The supplied mod label does not explain any separate unlock, so its practical difference is unclear.
Verdict
Install it if you want the paid astronomy toolkit and your device meets the Android 8.0 requirement. Before installing, compare this Version 4.7.5 build with the store version and review the listed crash-log and diagnostics collection.
FAQ
What can Mobile Observatory show for the August 12, 2026 eclipse?
It shows the eclipse path, local contact times, maximum obscuration, a rendered sky view, safety notes, and calendar actions for your location. The available information is location-based, so the displayed timing and visibility depend on where you use the app.
What does the Observing Plan Generator use to choose targets?
It uses your equipment, location, date, light pollution level, and minimum altitude. You can select naked-eye observing, binoculars, or a telescope when creating a target list.
What does the Version 4.7.5 modified build change?
The supplied label identifies Version 4.7.5 and mentions bug fixes and stability improvements. It does not specify a separate unlocked feature or explain a difference from the Google Play build, which is also listed as version 4.7.5.
What Android version does Mobile Observatory require?
Google Play lists Android 8.0 as the minimum requirement. The input does not provide a separate performance guarantee or device compatibility list.
Does Mobile Observatory require root access?
The supplied information does not state whether root access is required. It only identifies Android 8.0 as the minimum version and describes the app's astronomy and telescope functions.