Aciqra is a virtual planetarium for observers of the real sky.
Aciqra 2.3.1 brings a few notable changes since Aciqra 2.3.0. Rise, set and transit times are now determined through a binary search instead of a simple linear search. Comet rendering has been made more physically accurate for most situations. In addition, there have been some minor adjustments to the interface.
Downloads are available here: http://sourceforge.net/projects/aciqra/files/Aciqra%202/2.3.1/