Free planet software for linux

PDL::Transform::Cartography Perl module contains useful cartographic projections.

SYNOPSIS

# make a Mercator map of Earth
use PDL::Transform::Cartography;
$a = earth_coast();
$a = graticule(10,2)->glue(1,$a);
$t = t_mercator;
$w = pgwin(xs);
$w->lines($t->apply($a)->clean_lines());

PDL::Transform::Cartography includes a variety of useful cartographic and observing projections (mappings of the surface of a sphere), including reprojected observer coordinates. See PDL::Transform for more information about image transforms in general.

Cartographic transformations are used for projecting not just terrestrial maps, but also any nearly spherical surface including the Sun, the Celestial sphere, various moons and planets, distant stars, etc. They also are useful for interpreting scientific images, which are themselves generally projections of a sphere onto a flat focal plane (e.g. the t_gnomonic projection).

Unless otherwise noted, all the transformations in this file convert from (theta,phi) coordinates on the unit sphere (e.g. (lon,lat) on a planet or (RA,dec) on the celestial sphere) into some sort of projected coordinates, and have inverse transformations that convert back to (theta,phi). This is equivalent to working from the equidistant cylindrical (or "plate caree") projection, if you are a cartography wonk.

The projected coordinates are generally in units of body radii (radians), so that multiplying the output by the scale of the map yields physical units that are correct wherever the scale is correct for that projection. For example, areas should be correct everywhere in the authalic projections; and linear scales are correct along meridians in the equidistant projections and along the standard parallels in all the projections.

The transformations that are authalic (equal-area), conformal (equal-angle), azimuthal (circularly symmetric), or perspective (true perspective on a focal plane from some viewpoint) are marked. The first two categories are mutually exclusive for all but the "unit sphere" 3-D projection.

Extra dimensions tacked on to each point to be transformed are, in general, ignored. That is so that you can add on an extra index to keep track of pen color. For example, earth_coast returns a 3x< n > piddle containing (lon, lat, pen) at each list location. Transforming the vector list retains the pen value as the first index after the dimensional directions.

Xplns reproduces real starry sky on your display of X Window System. It calculates the position of many celestial objects (stars, galaxies, nebulae, constellations, planets, comets, etc.) very accurately.
You can enjoy the past and future sky on the desk top as if you have traveled all around the world. In solar system projection mode, you can examine motion of solar objects.
You can observe motion of the stars with tracking an object. The information display function let you know the rise, set and meridian time of solar objects, when dusk ends, when dawn starts, moon age, etc.
These functions are helpful for observing stars under the real sky. There are fourteen projection mode in xplns, "Horizontal View Mode", "Equatorial Mode", "Ecliptic Mode", "Galactic Mode", "Planisphere Mode" and "Solar System Mode".
Main features:
- Fourteen projection mode (Horizontal, Equatorial, Planisphere, Solar System, Planisphere mode, etc.).
- Display stars, nebulae, galaxies, planets, sun, moon, comets, minor planets, galilean satellites, etc.
- In addition to standard star catalog (up to magnitude 6.5), SAO star catalog and guide star catalog (GSC) supported.
- Display function of name of the constellations, planets, stars, nebulae, galaxies, etc.
- Magnified figure of planets.
- Grid of equatorial coordinates, ecliptic coordinates, horizontal coordinates, etc.
- Motional display of stars with continuous or real-time drive.
- Display function of Rise, set, meridian time of solar objects, moon age.
- Images of celestial objects.
Environment
- Linux 2.4 with libc5(ELF), glibc 2.1, 2.2 or 2.3 on i386
- FreeBSD 4.6.2, 4.7, 4.8 on i386
- XFree86 4.1 or later (256 or more colors)

This program enables you to draw sky charts, making use of the data in 16 catalogs of stars and nebulae. In addition the position of planets, asteroids and comets are shown.
The purpose of this program is to prepare different sky maps for a particular observation.
A large number of parameters help you to choose specifically or automatically which catalogs to use, the colour and the dimension of stars and nebulae, the representation of planets, the display of labels and coordinate grids, the superposition of pictures, the condition of visibility and more. All these features make this celestial atlas more complete than a conventional
planetarium.
Enhancements:
- The default database is now SQLite to simplify the installation process.
- MySQL is still available if need.
- Add the Calendar menu with more functions for the comets and asteroids.
- Add a display bar to quickly show or hide some object from the chart.
- Complete the menu with all the available functions.
- In the configuration menu you can set the nebulae color and preview the background picture.
- Now it use Xplanet (xplanet.sourceforge.net) to display the planet image on Linux.
- Plus a lot of bug fix the previous version was filled with.

KAstrHorloge is an astronomy software for Linux & KDE.
KAstrHorloge is provided with a 10000 stars database. For any of these stars or planets, the software can compute its position in the sky of your observation site. It displays the object location both in a map and in terms of coordinates (alpha and delta)
For each star or planet, you can add your own comments (for example, some physical data, or observation comments) and even a CCD image of the object !
All functions of KAstrHorloge are intuitive and easily accessible, so you can use this software without reading the doc !
Good observations !
Enhancements:
- Added a dialog to choose the geographic location
- Used libAstronomy and libnova for calculations

RSS-Planet is a custom marker file generator for xplanet which uses RSS feeds from news websites to plot the current headlines on a world map.

By default, Yahoo! News and CNN.com are supported, but other feeds that point to articles with easily-discoverable place names (such as the Washington Post) should work as well.

JourneySat lets you show to your friends and relatives the places youve travelled to. You can combine diary notes, photos and satellite images and embed them into your web site either when youre back home or when youre still on the road.
After writing a diary note and adding the photos of the day, you can find out the exact geographical location of the places youve visited to let your friends see them from a satellite viewpoint, using the images provided by Google Maps TM.
In this way theyll see much more than what can be normally experienced through photos. As a further bonus, you can even specify the locations where you shoot your photos and theyll be marked on the satellite view.
And, well, why limit oneself to documenting travels? You can use JourneySat for anything that you do on the planet Earth.
One more word before directing you to the demo: JourneySat is free software. That means both that it costs no money and that you can modify it as you wish. JourneySat is licensed under the GNU General Public License. Read the terms of the license.
Enhancements:
- Several bugs were fixed in the code and in the documentation.
- The internal API has been completed with the implementation of methods to navigate through and edit the sequences of places and contents.

Ophiuchus is a multiplayer strategy game in a similar vein as the Master of Orion series.
Ophiuchus will go through many phases where it is a completely playable game and it comes with further features added on with each major release.
The reason for this is that it is quite impossible for me to create a fully-featured game in one go. Doing it in steps allows me to re-check the game for gameplay quite often. (This also means I get to play it a lot, which serves to keep me interested.)
I aim to eventually create a game of rather large proportions, but this may well take some time. As such, I am concentrating on the gameplay of the game first, on the assumption that while graphics improve and change, gameplay stays eternal.
The game map is a rectangular board of tiles. A tile may contain a star. Each star is orbited by a single inhabitable planet. Each player starts out inhabiting a single planet, and owning 10 units of money.
Each planet a player owns adds 1 unit of money to their treasury per turn. You may build spaceships at your colonies, which cost 4 units of money, and take 1 turn to construct. Spaceships move across the map at a rate of 1 square per turn.
If a fleet encounters an uninhabited planet, it will automatically colonise the planet. If you encounter a planet owned by another player, you can attack and invade it. Combat works on the simple principle of winner-takes-all.
Whichever side has the larger fleet destroys the other side. If you retreat from combat, that is, if you order your fleet to leave a system while another player orders their fleet to attack yours, you lose a third of your ships.
You win the game by invading all colonies held by all other players.
Enhancements:
- When multiple players arrive at the same uncolonized system at the same time, none of them can colonize the planet now.
- Previously, the player with the lowest ID got the planet, leading to an advantage to players with lower IDs.
- This was a problem especially in single player mode, when it gave a great advantage to the player over the computer.
- Attack commands now always give feedback.

Zengaia Space project is a multiplayer game which can be played over a central Internet server.
In the game, you have to build ships, settle new planets, build new shipyards, fight your enemy, and conquer new planets and solar systems.
Enhancements:
- A large bug has been fixed that caused the MySQL connection to crash after about a day running the server.
- Now the server should be up 24/7 again.