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The Gnu Data Language (GDL) is a free alternative to the data visualization and analysis tool, called IDL (Interactive Data Language), frequently used by scientists. GDL and its library routines are designed as a tool for numerical data analysis and visualisation. GDL is dynamically typed, vectorized and has object-oriented programming capabilities. The library routines handle numerical calculations, data visualisation, signal/image processing, file input/output (incl. graphical and scientific data formats such as TIFF, PNG, netCDF, HDF etc) and interaction with host OS. Despite its name, GDL is not a GNU package.
Galaxy- Stellar Simulation
This is a candidate for deletion: Links broken. No links to page. Email to maintainer broken. Poppy-one (talk) 12:40, 31 July 2018 (EDT) Galaxy is a computer program which simulates the motion of stars under the influence of gravity. Create a field of random stars to begin with, then watch the stars move as they are accelerated by their mutual gravitational attractions. You can vary the number of stars and the strength of gravity. Watch how the attractive forces accelerate individual stars and send them careening in new directions. Watch how large groups of stars develop into interesting patterns over time, such as clusters and spiral arms.
'GCX' provides a complete set of data-reduction functions for CCD photometry, with frame WCS fitting, automatic target identification, aperture photometry of target and standard stars, single-frame ensemble photometry data reduction, multi-frame color coefficient fitting, extinction coefficient fitting, and all-sky photometry. 'gcx' also controls CCD cameras and telescopes and implements automatic observation scripting. It controls cameras through a hardware-specific server that it connects to through a TCP socket. It controls telescopes which use the LX200 protocol, and refines pointing by matching images to the GSC catalog position of stars. It also generates FITS files with comprehensive header information.
Global Village
Global Village is a Gnome application designed to place a front-end, or graphical user interface onto the CLI interface of Xplanet. Originally intended to create and update the desktop wallpaper in a gnome environment, showing a traditional rectangular projection of the planet Earth. Global Village now provides as many of the features of Xplanet as seem reasonable, and with the ability for plugins the scope is nearly limitless.
Gnuastro Heckert gnu.tiny.png
The GNU Astronomy Utilities (Gnuastro) is an official GNU package consisting of separate programs and library functions (in C and C++) for the manipulation and analysis of astronomical data. All the various utilities share the same basic command line user interface for the comfort of both the users and developers. GNU Astronomy Utilities is written to comply fully with the GNU coding standards so it integrates finely with the GNU/Linux operating system. This also enables astronomers to expect a fully familiar experience in the source code, building, installing and command line user interaction that they have seen in all the other GNU software that they use.
The GnuSkies Project was an attempt to create a 'Total Plug In' (TPI) application which was will eventually contain many features not yet implemented in xephem. gnuskies has been decommissioned as a GNU package.
Hitchhiker 2000
This is a candidate for deletion: Links broken. Email to maintainer broken. Poppy-one (talk) 15:57, 2 August 2018 (EDT) Hitchhiker 2000 is an astronomical simulation and visualization program. It displays the solar system in a window on your computer; you manipulate the field of view using the mouse. You can rotate a schene, zoom in and out, or view the scene from any angle. You can also control what objects are seen on the screen. You can also create an MPEG-formatted movie based on your current scene.
Karoo Array Telescope Communication Protocol library.
KStars is a graphical desktop planetarium. It plots the positions of stars, constellations, star clusters, nebulae, galaxies and planets in the night sky for any date, from any location on Earth. The display can be panned and zoomed, and it can even identify and track objects as they move across the sky. KStars is highly configurable, you can control what objects are displayed, and with what colors. Images of any part of the sky can be downloaded from online databases. Our plan is to make KStars an interactive tool for learning about astronomy and the night sky.
Functions and programs to calculate solar and thermal radiation in the Earth's atmosphere.

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