posted 07-02-99 04:52 AM ET
(Unity) Mission Years start at 2100, because that was the Earth year that they arrived at Chiron.But Chiron years have slightly different length than Earth years, so after 2100 they don't exactly correspond to Earth Years.
However, as far as the factions can tell, there's no-one (and according to the Planetmind, no life even) left on Earth to put the case for the Earth Style dating.