About this app

‘This book is rich in peculiarities for the interested observer’ - The Independent

The second edition of the Oxford Dictionary of Astronomy contains over 4,300 up-to-date entries covering all aspects of astronomy. Compiled with the help of over 20 expert contributors under the editorship of renowned author and broadcaster Ian Ridpath, A Dictionary of Astronomy covers everything from space exploration and the equipment involved, to astrophysics, cosmology, and the concept of time.

The entries have been fully revised and updated for this edition, and new entries have been added to reflect the recent developments within the field of astronomy, including magnetic reconnection, Fornax cluster, luminosity density, and Akatsuki.

The dictionary also includes biographical entries on eminent astronomers, as well as worldwide coverage of observatories and telescopes. Supplementary material is included in the appendices, such as tables of Apollo lunar landing missions and the constellations, a table of planetary data, and numerous other tables and diagrams complement the entries.

NEW! With the addition of a convenient Home page, a sleeker and more intuitive visual layout, as well as innovations in the speed of searches you can delve right in faster and easier than ever!

Also includes advanced search and language tools that have become the staple of quality language apps from MobiSystems, Inc.

SEARCH TOOLS - effortlessly find words thanks to a clear, functional, and easy-to-use interface.

Intelligent search integrates several tools to match or suggest what you are looking for:
 • Search autocomplete helps find words quickly by displaying predictions as you type
 • Keyword lookup allows you to search within compound words and phrases
 • An automatic ‘Fuzzy filter’ to correct word spelling, as well as ‘Wild card’ ('*' or '?') to replace a letter or entire parts of a word
 • Camera search looks up words in the camera viewfinder and displays results
 • Use our Voice search when you don't know how an entry is spelled
 • Share word definitions via installed apps on your device
 • Swipe-to-delete functionality in the Recent and Favorites menus.

LEARNING TOOLS - engaging features that help you further enhance your vocabulary.

 • ‘Favorites’ feature to create custom folders with lists of words from the extensive library
 • ‘Recent’ list to easily review looked-up words
 • ‘Word of the day’ section to expand your vocabulary daily
 • Home screen widget provides random words at a glance
 • Split screen support for Android 7 allowing you to use the dictionary simultaneously with other apps.

***This is a fully functional 30-day trial version***

Get MORE by purchasing the full version of the Oxford Dictionary of Astronomy:

 • Permanently unlock the complete features list
 • Offline mode - look up words without an internet connection
 • Premium Support – Get expedited support for any app-related issues
 • Ad-free

New features

In our ongoing efforts to improve user experience, we've focused on refining app performance and resolving issues to ensure a more seamless and reliable experience through the world of words.

App Permissions

Allows applications to open network sockets.
Allows applications to access information about Wi-Fi networks.
Allows applications to access information about networks.
Allows an app to create windows using the type TYPE_APPLICATION_OVERLAY, shown on top of all other apps.
Required to be able to access the camera device.
Allows an application to receive the ACTION_BOOT_COMPLETED that is broadcast after the system finishes booting.
Allows using PowerManager WakeLocks to keep processor from sleeping or screen from dimming.