Time Span between Events

Was Just taking some notes from the time table of the history of events since Peter Weylands speach (hope it is correct)....50 years later Prometheus project starts in 2073 AD and almost 50 years later from Prometheus is Nostromo's voyage to LV-426 in 2122 AD !00 years since Weyland's speech. Prometheus happens 2085. 12 years later from the start of the project. The discovery of Acheron LV-426 in the Zeta Reliculi is in 2042. 80 so years until ALIEN It was discovered by an astronomer who was a fan of the Alien movies. I Wonder if that is when they actually discover the signal from LV-426 So that's 31 years until Prometheus project from the discovery of LV-426. Unfortunately the astronomer did not live long enough to see the start of the Prometheus Project. But Weyland did, cause he has his very own cryo-pod. 31 years WOW 80 years from the discovery LV 426 to the landing of the Nostromo. I am assuming that the LV-200's are discovered even before that somewhere in between 2042 and 2039 when the first planet colony was terraformed. FTL fight in 2032 AD I hope to see that day. 20 years to go! It would make it a lot easier if we could Teleport spaceships into Space... first! Or shoot them into space with a giant magnetic sling shot. 2122 AD will be very interesting to see too but unless they invent Cryo-Sleep I don't think I'll get to party with those fans on that mega anniversary.