I must have no life whatsoever. I need a girlfriend, or a job, or something. Because I just spent nearly an hour arguing about what is and what is not canon in Gundam's Universal Century timeline.
The Universal Century timeline, by the way, is the original "universe" in which Gundam takes part in. The original series and its direct sequels (Z, ZZ, CCA, F91, and V) take place here. Also, several side story OVAs (0080, 0083, 08th MS Team, and MS Igloo). Also, there are several video games, side story manga, and novelizations. However, Sunrise has claimed that "if it's filmed, it's canon".