This applet is currently not working right -- I had to remove the star database for space reasons. (Planets and NGC objects should still be correct, for all the good that does. :-) I've moved the site and now have space, but I need to find a backup of the database. Sorry ...
You can show other areas of the
sky by editing the coordinates or scale, then hitting return.
Click on an object to display more information about that object.
The database contains stars down to about magnitude 7 (but it takes
quite a while to download all those stars over the net).
Source is available for the elliptical
orbit calculation class,
the StarChart class,
the Sky applet which handles the UI,
an astronomical date class,
and some coordinate classes.
It's all written by me, and you're welcome to look at it,
but not to remove the copyright notices or to use it commercially
without permission.
The algorithms come from Peter Duffett-Smith,
Practical Astronomy with your Calculator,
available from Willman-Bell.
The star database used is the Skymap database, courtesy of the
Astronomical Data Center,
parsed via a CGI script of my own.
Currently I'm showing only stars down to 8th magnitude, for space reasons.
Coming soon:
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