Mobile Observatory
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Before you install
- If Android refuses to install the file, the system is blocking installs from unknown sources. Allow this app in Settings, then choose to install anyway when prompted.
- If you see an "incompatible version" message, the build likely targets an older CPU architecture (ARMv7) that newer phones no longer accept. Look for an ARM64 (ARMv8) build of the same version instead.
Download FAQs
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.
The download link does not work
Reload this page and start the download again — links are generated per visit and expire. If it still fails, the file may be getting replaced with a newer build; try again shortly.
It says "App not installed"
That usually means a different signature of the same app is already on the device. Uninstall the existing copy first, then install this file. Back up in-app data beforehand, since uninstalling clears it.
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