The only reason Einstein's special theory of relativity seems weird to those learning it is that the velocities we're familiar with are such a tiny fraction of the speed of light we've never had a chance to gain an intuitive sense of relativistic effects. If the speed of light were 100 kilometres per hour, footballers would have no trouble dealing with relativistic goal shots. C-ship uses computer image synthesis to put you aboard a starship entirely consistent with the laws of physics and lets you look out the window to experience special relativity with your own eyes. This page provides tips for viewing Venus in the daytime, plus a calculator which shows the best opportunities for any year and produces finder charts for your observing site. Home Planet places the Earth in its place in the universe, allowing one to look up toward the stars or down upon the Earth from a variety of perspectives.
Comprehensive documentation is included in a hypertext help file.
For additional information and instructions on how to download and install the software, please see the online documentation . Moontool for Windows Microsoft Windows tool which displays the current phase of the Moon in an icon and other information when opened. The program is in the public domain and complete source code is available. For old time's sake, an updated 16-bit version compatible with Windows 3.0 and above is also available. All of these items can be individually selected to customise the display.