Please use the help-feature which is provided in the app (see right).

Version 2.50 (February 2015):
- New: Twilight diagram improved (full-screen when clicked, put midnight at center)
- New: Save/Restore all settings/favorites on external memory
- Calculation of events of Jupiter Moons much faster
- Issue with time display settings (24h/ampm) resolved
- Several small bugs resolved


Version 2.45 (January 2015):
- Several bugs corrected
- Improved selection of objects in Tonight's Best
- Near earth asteroid 2004 BL86 shown



Version 2.40 (December 2014):
- Jupiter and Saturn moons improved:
    - better and more precise display (eclipses, occultations,           shadows on Jupiter, position of GRS)
    - Moon events for Jupiter
    - Diagram for the next days shows all events and can be zoomed
- SkyView improved:
    - Landscape can be displayed
    - Minimize the object info window
    - Altitude is displayed when object path is shown
    - Moon is rendered in higher resolution
- Improved, all-new object search:
    - Auto-complete while typing object name
    - Search-speed much faster now
- Location search improved:
    - Internal city database includes city names in different languages
 - Long-press on "Now" in the TimeChangeBar pops up a hour-change bar (or day change if you long-press +T)
- New time and date library takes time-zone changes into account (e.g. Russian time zones have changed recently)


Version 2.31 (July 2014):
- Several small bugs corrected


Version 2.30 (July 2014):
- Photorealistic view of the Milkyway
- Show the path of planets, asteroids, and comets during the next months in Sky View


Version 2.22 (May 2014):
- New meteor shower added: May Camelopardalides
- Issue with loading Sun image resolved
- New Sun image resource: Magnetogram


Version 2.21 (May 2014):
- Several small bugs corrected
- Widget now shows live image of Sun
- New Google Maps used
- Automatically update database (minor planets, comets, meteor showers)


Version 2.20 (April 2014):
- Translation to Italian
- New Sun information page with current pictures and activity data
- Information about natural satellites of the Solar System (in Object Database)
- Positions of bright Saturn moons
- Physical ephemeris for Mars, Jupiter, and Saturn (longitude central meridian, planetographic latitude of Earth and Sun, etc.)
- Physical properties of Sun, Moon and planets
- Clicking on an event shows a view of the sky
- Tap on keywords (e.g. table-header) for brief description
- Links to useful astronomy websites


Version 2.10 (October 2013):
- Quicker launch of app
- New Time Slider: change the time or day by sliding a finger
- Navigation in Top Down View improved
- Improved on-screen object information in Sky View and Top Down View
- Atmospheric extinction taken into account in Sky View (stars fainter near the horizon)
- New button in Menu for quick access of Sky Zenith View
- Change stellar field depth (how many faint stars should be shown at certain zoom level): Sky View Preferences->Display->Stellar Field Depth
- Improved object selection on double-tap in Sky View
- Zoom with volume buttons
- Updated French translation
- Several small bug-fixes


Version 2.01 (October 2013):
- Bugfixes for Live View (Sensor Fusion is off by default. Turn it on in the Sky View Preferences)


Version 2.00 (October 2013):
- Improved Location settings
- Improved time/date dialog
- Live view improved (sensor fusion)
- Improved Sky View
- Light pollution simulation
- Orbits of comets and minor planets displayed in Top-Down-View
- French localization
- Additional object categories in database
- Several bugs removed



Version 1.99.5 (May 2013):
- Update to run on Kindle Fire (Amazon) devices


Version 1.99.4 (April 2013):
- New: Additional Moon events like librations, times of de/ascending nodes, maximum declination (select them from the preference menu on the Moon page)
- Several bug-fixes


Version 1.99.3 (March 2013):
- Small update with mainly bug fixes
Note: The extended PPM star catalog must be downloaded again due to structural changes.
- Improvement: Icon for direct access to Jupiter's satellites via Main Menu
- New: Great Red Spot transit times for Jupiter (on Ephemeris page)
- Three brightest comets (including PANSTARRS) and minor planets always displayed in Sky View
- Improvement: Faint stars of PPM catalog can be double-clicked in Sky View for more information
- Improvement: Initial start page for detailed object information can be modified


Version 1.99 (February 2013):
- New: Hidden Treasures List (110 Deep Sky objects with images)
- New: Asteroid 2012DA14 (close encounter with Earth on Feb 15)
- Improvement: Photorealistic stars (optional, can be toggled via Sky View Preferences->Display)
- Improvement: Select types of events to be shown in the Events Calendar
- Improvement: Backup/Restore Favorites on SD-card

ONLY FOR ANDROID 3.1 AND HIGER:
- New: Update and download catalogs online
- New: Extended star catalog (PPM Star Catalog, mv=11, >400 000 stars), download via Object Database->Download Catalogs
- New: extended Minor Planets database (can be updated daily online)
- Several bugfixes (e.g. twilight diagram, Russian timezones)


Version 1.96.4 (December 2012):
Correction of following issues:
- Favorites list could not be skimmed through
- After de- and re-installing the Favorites were lost
- Favorites are now saved on the SD-card (or external memory) in the folder "MobileObservatory"
- New object descriptions: M14, M21 - M41, C1 - C3, C22, some meteor showers

Version 1.96.3 (December 2012):
- Option for showing times in 12 or 24-hour format 
Correction of following issues:
- Textures of planets in 3D don't render on a few devices 
- Nightmode turns screen off on some devices 
- "Now"-button does not set time correctly when timezone is different to the device timezone 
- Date-setter dialog in landscape format is cut off 

Version 1.96 (December 2012):
- New: New starting screen with quick access to the most important features
- New: 2500 objects of the New General Catalog (NGC)
- New: Compass view (Azimuth & Altitude) in the object list and for each object separately
- New: Twilight diagram & times for golden and blue hours
- New: Overview information screen for each object
- New: 3D-view for planets
- Improved: Smoother sky view
- Improved: Object database
- Improved: NGC and IC IDs for all Deep Sky Objects
- Improved: Better stability for Android 4
- Improved: Nightmode refurbished
- Debugged: Timezone problem of Rise-Set-Widget solved
- Many little changes to improve the usability

Version 1.95 (October 2012):
- New: New object categories: Dwarf Planets, Binary Stars, Bright/Near-Earth/Trans-neptunian Minor Planets 
- New: Object descriptions for many objects (presently for about 100 objects available, can be updated online)
- New: Automatically generated visibility reports for all objects
- New: Improved night mode (adaptable)
- New: All object lists can be sorted
- New: Star ephemeris information extended (colors, binary star information)
- New: Screen orientation can be fixed and screen can be kept permanently turned on
- Improved: OpenGL graphics of planets
- Improved: Navigation between main screens via drop-down menu (no tabs anymore)
- Fix: Solved crash on startup for devices without external storage
- Improvement: Minor Planet and comet data updated

Version 1.94 (August 2012):
- New: Show objects below the horizon in Sky View
- New: Change interface language from Settings Menu
- Fix: Problem with adding event to calendar on Android ICS devices fixed
- Fix: Fixed some memory leaks
- Improvement: Time & date intitle bar marked in orange when current time is not set
- Improvement: Comet data updated

Version 1.93 (June 2012):
- New: Pluto added
- New: Spanish localization
- New: Follow object in Sky View
- Improvement: Additional ephemeris information
- Improvement: Rendering of sky improved
- Improvement: Better precision for position calculation of Solar System objects (VSOP87)

Version 1.92 (June 2012):
- Improvement: Venus transit in Sky View and visibility information 
- Bug removed: Crash when 2D-Hardware Acceleration activated

Version 1.91 (May 2012):
- New: Tonight's Best
- Improvement: Hide events that are not visible from your location
- Improvement: Easier centering of objects in Top-Down-View through double-tap
- Improvement: Set the number of objects per page in object lists

Version 1.90 (May 2012):
- New: Completely new improved user interface
- New: Optimization for tablets and landscape mode
- New: Define favorite objects 
- New: Detailed information about all 88 constellations
- New: Link to Wikipedia page for most objects
- New: Yearly visibility graphs showing magnitude and apparent diameter
- New: List of the 10 next solar and lunar eclipses
- New: Telrad Circles in Sky Map
- New: Help-button on each page
- Improvement: Better search function
- Many bug fixes

Version 1.82.1 (November 2011):
- Several bug-fixes

Version 1.82:
- New: Solar Eclipses with detailed visibility information
- New: Save events as entries in your phone's calendar
- Improvement: Calendar can optionally be viewed with detailed descriptions
- Improvement: Modify number of days of event calendar
- Improvement: Button to modify time by one week added

Version 1.81:
- New: Monthly calendar for each object
- New: Lunar Eclipses
- Better accuracy for computation of events (conjunctions, ...)
- Several bug-fixes 

Version 1.80:
- New: Comets
- New: Quick search for objects (to be extended in next version)
- New: Milky Way and Galactic Plane in Sky Map
- New: Information about events in the calendar
- Improvement: Preferences for Sky Map and Top Down View
- Improvement: Faster Sky Map rendering and pinch-to-zoom enabled
- Improved Top Down View of the Solar System
- Improvement: Tablet-friendly version
- Several bug-fixes 

Version 1.72 & 1.70:
- Force Close at start-up after update recovered
- New: Bright asteroids
- New: Interactive top-down view of the Solar System
- New: More deep sky objects (complete Caldwell Catalog with images)
- New: Additional information about stars (from Bright Star Catalog notes)
- New: Graphical display for visibility of objects during the year
- New: Change font sizes
- New: Screenshots
- Several bug-fixes 

Version 1.61:
- Improved layout and usability- New: Menu-page providing an overview over Solar System objects, meteor streams, Messier objects, bright stars
- New: Calender showing events occurring in the next two weeks
- New: Jupiter moons (to be extended in next version)
- Small bug-fixes

Version 1.53:
- Toggle automatic current location/time for Live Mode- Improved display on tablets
- Bug-fix: Crash at startup on some devices resolved

Version 1.50:
- New: Live mode (point device on sky and get information on what you see)
- New: Full screen mode
- New: On-screen information on field-of-view and objects
- New: Quick help dialogs
- New: Night mode (reduced screen brightness)
- Several small bug-fixes

Version 1.42:
- New: Meteor streams
- New: Overview lists of meteor streams and Messier objects
- Several small bug-fixes

Version 1.41:
- Bug-fix: Wrong constellation name in Object Information View corrected

Version 1.40:
- New: Zoomable star map
- New: Bright Star Catalog and Messier Objects
- New: Detailed information about all visible objects (Solar System objects, stars, Messier)
- New: Images of all Messier objects included
- New: Star names shown
- New: Calculate conjunctions of any object (e.g. the Pleiades) with the Moon or a planet
- New: Multi-touch supported in Horizon-Sky View: change viewing directions by sliding with one finger, change time by sliding with two fingers across display
- Double-tap on object for detailed information 

Version 1.32:
- New: Visibility Bar showing graphically day, night and twilight, rise and set times for an object on a specific day

Version 1.31:
- New: Ecliptic shown (in Grid View)- Bug fixed: Times between noon and 1pm were shown as “am”
- Several small bug fixes

Version 1.30:
- New: Horizon View of the sky
- Horizon View: Change time by swiping over sky and change view direction by swiping below horizon line
- Improved graphics in sky view
- Several small bug fixes

Version 1.25:
- New: Use Google Maps to search for locations

Version 1.24:
- Constellation lines added
- Change time by sliding across sky view
- Conjunctions of planets with Moon and other planets
- Change default start screen

Version 1.23:
- Current images of Sun in different wavelengths
- Small bugfixes

Version 1.22:
- Constellation names multilingual
- Azimuth/Altitude displayed with rise/set times
- All time fields are clickable
- Equatorial grid in sky view
- Sunspot number and radio flux included
- Incorrectly displayed moon phase corrected

Version 1.21:
- Display constellation names in sky view
- Select limiting stellar magnitude for sky view
- Choose planet image size in Ephemeris view

Version 1.20:
- View of the current sky

Version 1.13:
- Determination of location with GPS
- Option to show distances in km or miles
- Tap on events to jump to date
- Tap on rise, transit or set time in "Ephemeris View" to jump to this time
- Tap on information bar to set date and location
- Problem with internal location database solved (for locations in the Pacific)

On each page, there is a Help-button (top right) which opens a dialog with detailed information about the contents of that page.