generate a star chart

generate a star chart for a specified location

compute the date and properties of an eclipse

get information about a meteor shower

compute the location of a planet on a specified date

do computations with properties of planets, moons, etc.

compute location and other properties of a comet

compute location and get properties of a star

compare several stars

do computations with star properties

get information about an exoplanet

do computations using properties of exoplanets

compute location and get properties of a galaxy

compute the orbital period of a massive body orbiting another

compute cosmological properties of the universe

get information about an observatory

get information about a satellite

compare satellites

get information about a space probe

compare space probes