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Ephemeris
'Ephemeris' reads, writes, and interpolates the JPL planetary ephemeris data that is the world standard planetary dataset. It should compile on any machine that uses gcc and supports IEEE floating point arithmetic, and has been tested under GNU/Linux. It uses an included library, gnulliver.c, that automatically handles integer and floating point Big-endian/Little-endian byte swapping to match Big-endian/network order on any computer. gnulliver.c can be used separately under the LGPL 2.1. This is a redesign of JPL's original FORTRAN code, available on JPL's FTP website (ftp://ssd.jpl.nasa.gov/pub/eph/export/), with some added flexibility (including patching some inconsistencies in the original JPL data files). 'Ephemeris' is not associated with JPL or NASA, but just uses JPL's data.
FlightGear
FlightGear Flight Simulator (often shortened to FlightGear or FGFS) is a free, open-source, multi-platform, flight simulator, created by volunteers. FlightGear is an atmospheric and orbital flight simulator used in aerospace research and industry. Its flight dynamics engine (JSBSim) is used in a 2015 NASA benchmark to judge new simulation code to the standards of the space industry. FlightGear 2020.3 has 700+ aircraft in launcher with 1-click install and update, that can be filtered by advancement level in flight dynamics model (FDM), systems, or art. The rest are available through 3rd party hangars or from development repositories. Broad overview of features as of 2020: 3d buildings & roads for entire planet based on OpenStreetMap (OSM) data and automatic generation, terrain-driven weather simulation, addons, multiplayer environment, orbital rendering, a flexible and open aircraft modelling system, varied networking and interfacing options, multiple display support, multiple flight dynamics engines, multiple rendering pipelines, detailed weather visualisation with ALS renderer, a powerful scripting language, and other features suited for settings in research, industry, DiY projects, and desktop simulation, combined with an open architecture. Used professionally, as well as non-professionally. Platforms: Windows, GNU/Linux, Mac, FreeBSD, others. Compiles for ARM processors, including Raspberry Pi. See: Professional and Educational usages The FlightGear project has been used in a range of projects in research and industry, including by NASA for both Earth and Mars conditions (e.g. in ARES glider design for Mars[1]. It has been used as a research and development platform by various agencies and universities. Other than aerospace research and development, FlightGear is used in aviation or aviation-adjacent industries in various ways. For example, teaching student pilots procedures or handling in a simulator saving expensive flight time - e.g. FlightGear is integrated into various FAA certified training simulators[2], in contrast to use in full-motion (6-DoF) research simulators like at the University of Naples[3] where FlightGear is utilised for physics not just used for visualisation/interface. Similarly, FlightGear has been used to teach air traffic controllers (ATC)[4] and allows for dedicated ATC client/instructor interfaces as well as visuals using real-life ATC tools like binoculars or cameras - teachers can alter traffic, weather, re-create traffic patterns, and so on. Different forms of instructor stations are possible for different areas of instruction. FlightGear has also been used in general education e.g. exhibits in museums[5] and all sorts of DiY projects. About the project The simulator is created by an international group of volunteers, and released as free, open-source GPL software. The goal of the FlightGear project is to create a sophisticated and open flight simulator framework for use in research or academic environments, pilot training, as an industry engineering tool, for DIY-ers to pursue their favorite interesting flight simulation idea, and last but certainly not least as a fun, realistic, and challenging desktop flight simulator. Being free software, FlightGear has historically received development from the science and engineering community. Many contributors have had an academic background in engineering, maths, physics, or computer-science - in addition to some involvement or interest in aviation like being pilots (hobby, professional, test pilots, or retired). This is true especially among long-term contributors, and the academic insight has shaped the project's simulation standards.[6] There are many exciting possibilities for an open, free flight sim. It is hoped that this project will be interesting and useful to many people in many areas. History FlightGear started as an online proposal in 1996 by David Murr, living in the United States. He was dissatisfied with proprietary, available, simulators citing motivations of companies not aligning with the simulators' users, and proposed a new flight simulator developed by volunteers over the Internet.[7] Development of an OpenGL based version was spearheaded by Curtis Olson starting in 1997. FlightGear incorporated other open-source resources, including the LaRCsim flight dynamics engine from NASA, and freely available elevation data. The first working binaries using OpenGL came out in 1997. By 1999 FlightGear had replaced LaRCsim with JSBSim built to the sims' needs, and in 2015 NASA used JSBSim alongside 6 other space industry standards to create a measuring stick to judge future space industry simulation code. The FlightGear project has been nominated by SourceForge, and subsequently chosen as project of the month by the community, in 2015, 2017, and 2019.[8] [9] [10]
GDL
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
'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.
Gnuskies
The GnuSkies Project is an attempt to create a 'Total Plug In' (TPI) application which will eventually contain many features not yet implemented in xephem.
Gravit Sandbox
Gravit is a gravity sandbox made with python and pygame. It is composed of a launcher and a simulator.
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.
Interval RPN Calculator
This terminal app runs on PCs or laptops running Windows, OSX or GNU/Linux. It attempts to mimic the functionality of an HP ReversePolishNotation [RPN] calculator with the added enhancement of interval output. So along with your answer, you get a good idea of its trustworthiness.
JavAstro
A collection of astronomy tools written in java: sky map, astronomical events, ephemerides, planet visibility, moon calendar and galilean moons.
KATCP
Karoo Array Telescope Communication Protocol library.
Kstars
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.
LibRadtran
Functions and programs to calculate solar and thermal radiation in the Earth's atmosphere.
Libnova
'libnova' is a general purpose, double precision, celestial mechanics and astronomical calculation library. It can calculate aberration, nutation, apparent position, dynamical time, Julian day, precession, proper motion, sidereal time, solar coordinates (using VSOP87), coordinate transformations, planetary positions (Mercury - Neptune using VSOP87), planetary magnitude, illuminated disk and phase angle, lunar position (using ELP82), phase angle, elliptic motion of bodies (Asteroid + Comet positional and orbit data), asteroid + comet magnitudes, parabolic motion of bodies (comet positional data), orbit velocities and lengths, atmospheric refraction, rise/set/transit times, and semidiameters of the Sun, Moon, planets, and asteroids.
Librsb
librsb is a library for sparse matrix computations featuring the Recursive Sparse Blocks (RSB) matrix format. This format allows cache efficient and multi-threaded (that is, shared memory parallel) operations on large sparse matrices. The most common operations necessary to iterative solvers are available, e.g.: matrix-vector multiplication, triangular solution, rows/columns scaling, diagonal extraction / setting, blocks extraction, norm computation, formats conversion. The RSB format is especially well suited for symmetric and transposed multiplication variants. On these variants, librsb has been found to be faster than Intel MKL's implementation for CSR. Most numerical kernels code is auto generated, and the supported numerical types can be chosen by the user at build time. librsb implements the Sparse BLAS standard, as specified in the BLAS Forum documents.
Mpc Heckert gnu.tiny.png
MPC is a complex floating-point library with exact rounding. It is based on the GNU MPFR floating-point library, which is itself based on the GNU MP library. This is a C library for the arithmetic of complex numbers with arbitrarily high precision and correct rounding of the result. It extends the principles of the IEEE-754 standard for fixed precision real floating point numbers to complex numbers, providing well-defined semantics for every operation. At the same time, speed of operation at high precision is a major design goal.
Msetimon
This program was written to monitor SETI@home activity that may be running on multiple computers or multiple instances on the same computer.
NMod nBody Modelling Toolkit
nMod nbody toolkit is a collection of tools designed to enable researchers to perform experiments using a particle-particle nBody model that runs on standard home computers.
The toolkit contains a particle-particle model, functions to enable the simulation of spacecraft flight, and an opengl viewer to display the resulting time series data.

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