These applets were orginally a part of of Java-based astronomic package for Sharp Zaurus PDA (the Akklets project). When obtained, it did not run properly under standard OpenJDK due different interpretation of Date(String) constructor, but for Ultrastudio it did not take a long time to fix it. The applets are written by Akkana Peck, and have been available at http://www.shallowsky.com/software/javastuff.html and declared at http://www.shallowsky.com/software/index.html as "It's all free open source "software libre". Exact license (GPL) is specified in directly in the code. Akkana has been contacted, informing her that applets are in use in Ultrastudio.org , and responded with approval.