<chapter id="astroinfo"> <title>The AstroInfo Project</title> <para> Here you can find a collection of short articles that explain various astronomical concepts used in &kstars;. From coordinate systems to celestial mechanics, you can find answers to your questions here. </para><para> The articles sometimes also contain exercises that you can perform with &kstars; to illustrate the concept behind the article. </para> &contents; <!--AstroInfo: Table of Contents--> &skycoords; <!--AstroInfo: Celestial Coordinate Systems--> &cequator; <!--AstroInfo: Celestial Equator--> &cpoles; <!--AstroInfo: Celestial Poles--> &csphere; <!--AstroInfo: Celestial Sphere--> &ecliptic; <!--AstroInfo: The Ecliptic--> &equinox; <!--AstroInfo: The Equinoxes--> &geocoords; <!--AstroInfo: Geographic Coordinates--> &greatcircle; <!--AstroInfo: Great Circles--> &horizon; <!--AstroInfo: Horizon--> &hourangle; <!--AstroInfo: Hour Angle--> &meridian; <!--AstroInfo: Local Meridian--> &precession; <!--AstroInfo: Precession--> &zenith; <!--AstroInfo: The Zenith--> &julianday; <!--AstroInfo: Julian Day--> &leapyear; <!--AstroInfo: Leap Year--> &sidereal; <!--AstroInfo: Sidereal Time--> &timezones; <!--AstroInfo: Time zones--> &utime; <!--AstroInfo: Universal Time--> &blackbody; <!--AstroInfo: Blackbody Radiation--> &darkmatter; <!--AstroInfo: Dark Matter--> &flux; <!--AstroInfo: Flux--> &luminosity; <!--AstroInfo: Luminosity--> ¶llax; <!--AstroInfo: Parallax--> &retrograde; <!--AstroInfo: Retrograde Motion--> &ellipgal; <!--Elliptical Galaxies--> &spiralgal; <!--Spiral Galaxies--> &magnitude; <!--AstroInfo: The Magnitude Scale--> &stars; <!--AstroInfo: Stars: An Introductory FAQ--> &colorandtemp; <!--AstroInfo: Star Colors and Temperatures--> </chapter>