sci-astronomy/celestia A 3D space simulation that lets you travel through the solar system
sci-astronomy/ephem CLI, screen-based, retro astronomical ephemeris
sci-astronomy/gpredict Gpredict is a real time satellite tracking and orbit prediction program
sci-astronomy/skychart-bin Free Software to draw sky charts
sci-astronomy/stellarium Planetarium
sci-astronomy/xephem Interactive astronomical ephemeris for the serious amateur astronomer


heirecka Heiko Becker's dev repo (dev)
johnnywho John Kallimanis 's dev repository containing mostly scientific packages. (third-party)