I have been working on this problem for several months. i wasn't even sure where to post this question, but it is in respect to a pretty simple equation of distance/time=speed [right? it would be really bad if i got THAT wrong too] i'm trying to make my sci-fi book as acurate as possible and want to get my times and speeds prety close. this is the problem: how many multiples of the speed of light would you have to be going at to travel 4.5mly in more than 6 months 150klys in between <3 and >20 days the multiple of the speed of light would be the hyperdrive "rating" even though they were still traveling at subluminal speeds locally. so i broke everything down into miles and seconds. 3x10^15 miles/15x10^6 seconds= 200,000,000 m/s to travel 4.5 mly in 6 months 10^13 miles/2x10^8 m/s= about 13 days so 1000 times the speed of light. this all seemed to fit. however i recently read in a physics book that at 1500 times the speed of light it would take 6 hours to travel ONE lightyear. and i knew i screwed up somewhere, and i don't have a clue where becuase i came home and checked all my math and am still at a loss.