To Sebastian Stoff in his email supporting and courtesy, and of course for his "Orbitron"

To Robert Matson for driver ansi.com and my software optimization.

To Chris Marriot for his "SkyMap" software and his help by email

All' ing. Roberto Mantovani per le discussioni sulle coniche

Al collega G. Bettoni per i suggerimenti nella sezione Il cielo del mese

Al sapiente e disponibilissimo Giacomo iw2dmp per il pronto soccorso dopo un infausto crash dell' HD