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

Free download with optional Pro upgrade

Screenshots

See Mobile Observatory in action

Sky View — Moon & Jupiter over the real horizon with constellation lines and Milky Way

Comets — Clearer tails and better visibility in Sky View

Red Night Mode — Improved readability in the dark

Popular Objects — See at a glance which planets, stars, and deep sky objects are visible tonight

Upcoming Events — Never miss a conjunction, eclipse, meteor shower, or planetary opposition

Deep Sky — Browse nebulae and star clusters with a camera/telescope field-of-view frame overlay

Sun's Daily Path — Track the Sun's arc across the sky over your real topographic horizon throughout the day

Observing Planner — Auto-generate optimized observation lists for your location and equipment

Telescope Control — Point your GoTo telescope at any object directly from the app via INDI protocol

Solar System 3D — Comet with Realistic Tail

Solar System 3D — Saturn with Detailed Rings

Solar System 3D — Earth & Moon with Eclipse Shadow

Solar System 3D — Earth with City Lights at Night

Solar System 3D — Lunar Eclipse

Sun & Solar Activity — Live sunspot map, solar cycle tracking, and aurora forecast

Moon — Detailed lunar phase, libration, terrain features, and next eclipse info

Star Details — In-depth data for every star including variability, spectral class, and visibility

How It Works

From first launch to expert observer

1

Discover

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

2

Explore

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

3

Master

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

Start exploring tonight

Dive Into the Details

Scroll through real app screens — tap to enlarge

Sun & Solar Activity

Moon

Lunar Eclipse

Jupiter

Algol — Variable Star

Twilight

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: The arrival of Volume 4 marked an expansion into refined digital design systems, including character schematics and functional ui architectures.

The successfully combines the performance of the Quatre series with genuine portability. It is suitable for field technicians, mobile workshops, and emergency response teams.

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If you are referring to a piece of hardware, "portable" in this context usually refers to portable nail drills LED curing lamps

Subtle background details, insignia, and equipment schematics that invite the viewer to imagine a much larger, sprawling sci-fi universe.

The sculpture comes with a custom, protective case that makes it easy to transport.

Creating a solid piece based on the information provided seems to be a bit unclear due to the phrasing of the request. However, interpreting "gg quatre vol4 1 portable" as a prompt to design or conceptualize a product or piece of art that could be considered solid and portable, I'll guide you through a creative process.

: Set your application scratch disk to your fastest internal SSD partition. Efficient Cloud Syncing

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Dual-source USB-C PD 3.0 / Internal High-Density Battery Pack

Specifically Goethe’s works from the Portable Library of Liberty ?

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 gg quatre vol4 1 portable

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 Before committing to any software, it's wise to

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 It is suitable for field technicians, mobile workshops,

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

New

★★★★★

"The update to version 4 brings several interesting graphical and functional improvements. It's incredibly realistic; the horizon profile at your observation location allows for more precise calculations of star rises and sets. The 3D view has been significantly improved, with updated graphics for the well-rendered planets, and every astronomical event is faithfully reproduced. A full 5 stars for this beautiful app, an indispensable tool for both amateur and professional astronomers."

Google Play User

March 2026

New

★★★★★

"If you're wondering which special objects are in the constellation you're looking at right now, and when they can best be observed, then this app is exactly right for you. I've tried just about every astronomy app out there. My conclusion: by far the most valuable app for amateur astronomers who want to explore the night sky themselves with their own telescope."

Google Play User

March 2026

★★★★★

"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

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

Recommended for all new users

Free features included:
Interactive Sky View with live mode
Rise/Set times & visibility info
Jupiter & Saturn moons positions
Basic star & planet data

Unlock premium in the app: 2.5M+ stars, satellite & ISS tracking, 60,000+ asteroids & comets, 3D Solar System, telescope control, observing planner, and much more. Choose a subscription with 7-day free trial or a one-time purchase.

Recommended app — free download with flexible premium upgrade

🚀

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

Prefer buying up front? Get Mobile Observatory Pro

Experience the Realistic Sky Rendering

About the Developer

The story behind Mobile Observatory

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.