Taiyoukei is astronomy software for the Pocket PC focusing on the Solar System.
Some, but not major, functions require an online connection. 
Should run on Windows CE3.0, Pocket PC 2002 and Pocket PC 2003 operating systems.
As of this file date, supported CPUs are ARM, XScale, MIPS, SH3.
Taiyoukei is tested on a Toshiba Genio e550G with Pocket PC 2002, XScale CPU and
iPAQ h2210 with Pocket PC 2003.
Other O/S and CPUs have NOT been tested. Various user reports were positive,
however, NO GUARANTEE and NO LIABILITY whatsoever!

Status: Freeware (basically unsupported)
Note: Use at your own risk.
Author: Robert Brenner, Tokyo
email: robachi@aol.com
website: http://www.alfcen.com/pocket

Enjoy!