A couple of years ago I investigated how to program my TI calculator to help me locate objects inthe sky. After many hours of research and trial and error I came up with a solution. By communicating with members of IIS I was able to find coordiantes of Messier and NGC objects and program these into the calcualtor.
Last April Troy Greenwald from the USA contacted me via email and aksed if minded if he made some additions to the program. I was stoked that somebody else found the program useful. Troy added star data and then wrote the code to include planet positions.
If you have a TI-83+ or a TI-84 calcualtor you can download the program from here
http://www.ticalc.org/archives/files...446/44686.html
At last visit to the site some 700 downloads had occurred. Troy has been the only person though to contact me.