You are now in the directory "astro".
Here are the one-line descriptions for each items in this directory:
ephem-4.28: An interactive terminal-based astronomical ephemeris program. luna-1.9: Display her phase. saoimage-1.22: Smithsonian Astrophysical Observatory image utility for X sattrack-3.1.6: Real-time satellite tracking and orbit propagation program. ssystem-1.4: OpenGL Solar System simulator for X Window System. stars-1.0: Star field demo. sunclock-1.4: Shows which portion of the Earth's surface is illuminated by the Sun. xearth-1.0: Set the root window to the image of earth. xephem-3.1: an interactive astronomical ephemeris program xphoon-91.9.18: Set the root window to the moon in its current phase xtide-1.6.2: Harmonic tide clock and tide predictor