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23.  Write short notes on celestia and GNU cash.


1)              Celestia
Celestia is a freely-distributed, multi-platform, open source, software package which has become a valuable tool for astronomy education. It provides photo-realistic, real-time, three-dimensional viewing of the Solar System, the galaxy and the universe. It is used in homes, schools, museums and planetariums around the world. It also is used as a visualization tool by space mission designers.

Celestia comes with a large catalog of stars, galaxies, planets, moons, asteroids, comets, and spacecraft. We can download dozens of easy to install add-ons with more objects. It also runs on various platforms such as Windows, Macintosh (Mac OS X) and Linux operating systems.
Although it is optimized for 3D astronomical visualization, Celestia can be used to display and explore other 3D environments, too. And, for some reason, many people seem to find exploring with Celestia to be a lot of fun.




2)         Gnu Cash

Gnu Cash is a source accounting program that implements a double-entry bookkeeping system. It was initially aimed at developing for small accounting. Recent development has been focused on adapting to modern desktop support-library requirements.
On the other hand, Gnu Cash does accounting and transactions in a more transparent manner. This makes it easier for students to learn the basics of double entry bookkeeping. This is why some reviewers say that Gnu Cash is "good as educational software"
Gnu Cash is part of the GNU Project, and runs on Linux, OpenBSD, FreeBSD, Solaris, Mac OS X, and other like platforms. A Microsoft port was made available starting with the 2.2.0 series.









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