Astro-satpass This package contains classes needed to predict satellite visibility, and a demonstration application (satpass) that makes use of these classes. The classes themselves are: Astro::Coord::ECI - superclass (coordinate transforms) Astro::Coord::ECI::Moon - Predict location of the Moon. Astro::Coord::ECI::Star - Predict location of a star. Astro::Coord::ECI::Sun - Predict location of the Sun. Astro::Coord::ECI::TLE - Predict location of a satellite. Astro::Coord::ECI::TLE::Iridium - Subclass of TLE, with the ability to predict flares. Astro::Coord::ECI::TLE::Set - Aggregation of TLEs, with ability to use the correct TLE depending on time. Astro::Coord::ECI::Utils - Constants and utility subroutines. This package is installable by the usual incantation: gunzip Astro-satpass-9.999.tar.gz tar -xf Astro-satpass-9.999.tar perl Makefile.PL make make test make install You should substitute the appropriate program name for 'make', eg nmake (typically) under MSWin32, or mms or mmk under VMS. See ftp://ftp.microsoft.com/Softlib/MSLFILES/nmake15.exe for a copy of nmake for MSWin32 if you need it. Of course, since it's pure Perl, you can just expand the kit and drop the .pm files into the Astro/Coord/ECI directory (creating it if necessary) in the appropriate place in your @INC directories. Tom Wyant