Thank you to the people who have informed me that many of these applets are no longer working. There seems to be some problem with the newer versions of the Java Runtime Environment that prevents these applets from working. I would like to fix them, but I do not have the time to take on any non-paid work. If you like these applets and want to see them working again, please consider making a donation using one of the buttons on this page. If I see some donations coming in, I will be in better shape to find out what's wrong and to fix it.
All the best,
4 January 2013
These Java applets were written when I was working for the Physics and Astronomy Department at the University of British Columbia.
Some of these applets contain deprecated features (the Black Body applet, in particular). I'm slowly working to update these applets, but they may cause some older browsers to crash. To avoid any such trouble, I strongly advise people to use the latest Java plugin from Sun (JRE version 1.4 at least).
If you have any questions, feel free to contact me.Rob Scharein
If you like these simulations, please help support Hypnagogic Software so that they can be improved and updated.
Click on the button below to make a donation, at whatever level you choose (in Canadian dollars):
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|Phases of the inner planets (interactive Java animation)|
|Retrograde motion (interactive Java animation)|
|Kepler's Laws (interactive Java animation)|
|Cratering (Java applet)|
|Solar Eclipses (interactive Java animation)|
Click on the image to run the applet of your choice.