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Classroom9x !free! Jun 2026

Your Android observatory with real-time sky view, AR, telescope control, and the only astronomy app that computes your local horizon from topographic data.

Discover. Explore. Master.
Get it on Google Play
Mobile Observatory Dashboard
200,000+ Installs Across All Versions
4.7 Stars (4,800+ Ratings)
14+ Years of Development
5 Languages

All in One App

Everything you need for astronomy, in your pocket

AR Sky View

Point your phone and identify stars, planets, and constellations live

3D Solar System

Explore planets, moons, and comets in an interactive orrery

Satellite Tracking

ISS passes, Starlink trains, and 10,000+ satellites in real-time

Deep Sky Catalog

2,500+ nebulae, galaxies, and star clusters with photos and details

Event Calendar

50+ event types including eclipses, conjunctions, occultations, transits, and more

Smart Notifications

Aurora alerts, solar flares, ISS passes, and event reminders

Live Space Weather

Aurora forecast, Kp-index, solar flares, and NASA SDO images

Moon & Sun

Phases, eclipses, lunar features, sunspot data, and rise/set times

Topographic Horizon

Real terrain profiles from NASA data for precise rise/set times

Observing Planner

Auto-generated session plans based on your equipment and location

Telescope Control Beta

Connect your GoTo telescope and slew to any object with a single tap

2.5M+ Stars

Hipparcos, SAO, and extended catalogs with detailed star data

Get it on Google Play

Free download with optional Pro upgrade

Screenshots

See Mobile Observatory in action

How It Works

From first launch to expert observer

1
Discover the Sky with Real Terrain

Discover

Point your phone at the sky and see stars, planets, and the Sun's path over your real 3D terrain.

2
Explore Astronomical Events

Explore

Browse upcoming conjunctions, eclipses, ISS passes, and thousands of celestial objects with detailed data.

3
Plan Your Observing Session

Master

Generate optimized observing plans, control your telescope, and log your observations like a pro.

Get it on Google Play

Start exploring tonight

Dive Into the Details

Scroll through real app screens — tap to enlarge

Sun & Solar Activity
Sun & Solar Activity
Moon Details
Moon
Lunar Eclipse Details
Lunar Eclipse
Jupiter Details
Jupiter
Algol Variable Star
Algol — Variable Star
Twilight
Twilight

Classroom9x !free! Jun 2026

Since 9th graders are prone to off-task browsing:

Ultimately, while the game CLASSROOM 9 represents the most focused answer, the term's ambiguity is its strength, reflecting the diverse ways we interact with digital learning and entertainment today.

Something clicked inside Leo, and it wasn't the radiator.

Locating logic-based and educational games that align with academic goals. Share public link

I can make it more if it’s for a school assignment, or lean further into the humor of being a "professional" slacker.

Mimicking the building and shooting mechanics of major console titles, 1v1.LOL allows players to practice mechanics or play rapid multiplayer matchups directly in a web window. The Dual Perspective: Fun vs. Classroom Distraction

As strict content filters block mainstream gaming networks, platforms like have emerged as the go-to alternative for casual entertainment during study breaks and free periods. This comprehensive guide covers how Classroom9x operates, its catalog composition, and the security precautions users should consider. 🎮 What is Classroom9x?

Classic virtual billiards with precise aiming paths, ideal for intermittent pacing between lectures. The Evolution of the "Classroom" Unblocked Gaming Network

The game requires intense focus and a good memory, as the room's geometry and contents can shift unpredictably after each photo is taken.

Slower, highly engaging games often tolerated more readily within academic spaces due to their cognitive benefits and silent operation.

Transitioning to a 9X classroom requires careful planning. Follow this roadmap to ensure a smooth rollout.

: Building tools for auto-grading or real-time data insights similar to platforms like Classwork .

| Feature | Traditional Classroom | "Classroom9x" Environment | | :--- | :--- | :--- | | | Browser-based extensions and apps | Native OS Agent for Windows with deep system integration | | Student Grouping | Static, manual list generation | Dynamic Student Groups for real-time, need-based segmentation | | Control & Visibility | Limited to browser tabs | Full desktop visibility with the ability to push content and block sites | | Session Management | Fixed settings for a class period | Dynamic session options that can be modified during a live class (chat, hand raise, etc.) | | Student Wellness | Separate, siloed systems | Integrated wellness reporting directly from the classroom view | | Accessibility | Standard screen viewing | Premium student screen sharing directly from thumbnail view for enhanced collaboration | | Flexibility | Rigid schedules and permissions | Enhanced scheduling capabilities for unique school hours and flexible password resets |

Use privacy-focused browsers or extensions that block script trackers.

Core Features

Tools for astronomers, astrophotographers, and anyone who looks up

3D Solar System

Explore the solar system in an interactive 3D view

  • All planets, dwarf planets, and major moons
  • 1,000+ comets with realistic orbits
  • Time-travel to any date in history
  • Accurate positions and orbital mechanics

Satellite Tracking

Track the ISS, Starlink, and thousands more classroom9x

  • 10,000+ satellites with live positions
  • ISS pass predictions for your location
  • Starlink train visibility alerts
  • Iridium flares and bright satellite passes

AR Sky View & Time-Lapse

Point your camera and explore the sky

  • Identify stars, planets, constellations live
  • Time-lapse animation with swipe control
  • Watch planets cross the sky
  • Track satellite passes in real-time

Live Space Weather

Real-time aurora and solar activity dashboard Since 9th graders are prone to off-task browsing:

  • Aurora oval forecast with hemisphere view
  • Planetary Kp-index for geomagnetic storms
  • GOES X-ray flux and solar flare chart
  • Hourly NASA SDO solar images

Tonight's Best

Personalized recommendations for your location

  • Best objects visible tonight
  • Based on your actual horizon
  • Filter by object type and brightness
  • Optimal viewing times included

Comprehensive Catalogs

Massive astronomical database at your fingertips Share public link I can make it more

  • 2.5 million stars (optional download)
  • Complete Messier, NGC, Caldwell catalogs
  • 60,000+ asteroids & 1,000+ comets
  • Starlink satellites & ISS

Planning Tools

Plan your observing sessions in advance

  • Rise/set/transit against real horizon
  • Automatic visibility reports
  • Favorite locations with easy access
  • Twilight times and day length

Solar & Lunar

Detailed Sun and Moon information

  • Live Sun imagery and sunspot data
  • Moon phases with realistic rendering
  • Lunar librations and orbital data
  • Solar & lunar eclipse predictions

Recent Google Play Reviews

Fresh 5-star feedback from astronomers around the world

★★★★★
"This app is simply fantastic and keeps getting better. It offers a huge variety of features, making it the most professional app in the Play Store."
Google Play User
December 2025
★★★★★
"Version 4 is amazing: intelligently programmed, very well organized. Thank you for this excellent work!"
Google Play User
November 2025
Get it on Google Play

Trusted by a global astronomy community

The Recommended Way to Start

New users should begin with the freemium app, then unlock premium inside the app when they are ready. If you prefer buying up front, Mobile Observatory Pro remains available as the classic paid edition.

🚀

Mobile Observatory Pro

Classic paid edition for users who prefer a separate upfront purchase

  • One-time purchase directly on Google Play
  • All premium features unlocked from the start
  • Same lifetime premium access as the one-time purchase inside Mobile Observatory
  • Separate app for users who prefer buying up front
  • Existing Pro users can continue using it
Get Mobile Observatory Pro Prefer buying up front? Get Mobile Observatory Pro

Experience the Realistic Sky Rendering

About the Developer

The story behind Mobile Observatory

Wolfgang Zima

Wolfgang Zima

Creator of Mobile Observatory

Wolfgang Zima spent years as a professional astronomer before finding his way into software development. After completing his PhD in Astronomy at the University of Vienna, he worked as a postdoctoral researcher at the Institute for Astronomy at KU Leuven in Belgium for five years. It was there that he discovered a passion for scientific software — writing tools for analyzing spectra of pulsating stars and building a CCD image simulator for ESA's PLATO mission, a space telescope searching for Earth-like exoplanets.

Mobile Observatory started almost by accident: when his Nokia phone broke on a mountain biking trip in late 2010, Wolfgang got his first Android phone and was surprised that no good astronomy apps existed. So he built one. First released in January 2011, Mobile Observatory has since grown into one of the most comprehensive astronomy apps for Android and has been continuously improved for well over a decade.

Wolfgang lives in Freiburg, Germany, where he works as a Senior Mobile Developer at sevdesk. He continues to develop Mobile Observatory with the same enthusiasm as on day one — now with the help of modern AI tools that let him bring new features to life faster than ever.

Since 9th graders are prone to off-task browsing:

Ultimately, while the game CLASSROOM 9 represents the most focused answer, the term's ambiguity is its strength, reflecting the diverse ways we interact with digital learning and entertainment today.

Something clicked inside Leo, and it wasn't the radiator.

Locating logic-based and educational games that align with academic goals. Share public link

I can make it more if it’s for a school assignment, or lean further into the humor of being a "professional" slacker.

Mimicking the building and shooting mechanics of major console titles, 1v1.LOL allows players to practice mechanics or play rapid multiplayer matchups directly in a web window. The Dual Perspective: Fun vs. Classroom Distraction

As strict content filters block mainstream gaming networks, platforms like have emerged as the go-to alternative for casual entertainment during study breaks and free periods. This comprehensive guide covers how Classroom9x operates, its catalog composition, and the security precautions users should consider. 🎮 What is Classroom9x?

Classic virtual billiards with precise aiming paths, ideal for intermittent pacing between lectures. The Evolution of the "Classroom" Unblocked Gaming Network

The game requires intense focus and a good memory, as the room's geometry and contents can shift unpredictably after each photo is taken.

Slower, highly engaging games often tolerated more readily within academic spaces due to their cognitive benefits and silent operation.

Transitioning to a 9X classroom requires careful planning. Follow this roadmap to ensure a smooth rollout.

: Building tools for auto-grading or real-time data insights similar to platforms like Classwork .

| Feature | Traditional Classroom | "Classroom9x" Environment | | :--- | :--- | :--- | | | Browser-based extensions and apps | Native OS Agent for Windows with deep system integration | | Student Grouping | Static, manual list generation | Dynamic Student Groups for real-time, need-based segmentation | | Control & Visibility | Limited to browser tabs | Full desktop visibility with the ability to push content and block sites | | Session Management | Fixed settings for a class period | Dynamic session options that can be modified during a live class (chat, hand raise, etc.) | | Student Wellness | Separate, siloed systems | Integrated wellness reporting directly from the classroom view | | Accessibility | Standard screen viewing | Premium student screen sharing directly from thumbnail view for enhanced collaboration | | Flexibility | Rigid schedules and permissions | Enhanced scheduling capabilities for unique school hours and flexible password resets |

Use privacy-focused browsers or extensions that block script trackers.

Ready to Explore the Night Sky?

Download the recommended app for new users. Premium can be unlocked later inside the app.

Recommended Version Get Mobile Observatory
Classic Paid Edition Get Mobile Observatory Pro