The talk will outline some of the concepts and measurement methods in present day astronomy. There will also be examples of Linux software including xplns and nightfall, and I'll show Xephem working.
To explain how booting works, whether with GRUB or with LILO, I've got a short presentation about booting in general. GRUB is a boot loader that was not written specifically for Linux, but it does know a lot about Linux. It can make use of some features that have only recently been added to LILO, and it understands file systems and networking. GRUB is sometimes useful as a disaster recovery tool.