PLANETARIUM draws a chart of stars from horizon to horizon for any place on
earth and any reasonable time (it calculates the Julian Date). It starts with
the time (and date) it gets from your system, expecting Central Europeen Time.
You can change it selecting the appropriate item from the pulldown-menu. Most
stars down to third magnitude are shown and some fainter are added where the
constellation requires them. Magnitude and apparent brightness correspond to the
colours (grayscale) used by the program, planets are marked red. Include Basic
source, Author: Rolf Kühr