Short and sweet.
A light year is a measure of DISTANCE. Not time. Specifically the distance light travels over a a year. Google says 9,460,730,472,580 kilometers. A real long fucking way. But... still 365 days.
Parsec. It's a distance. Not knowing what the hell Han is talking about in the Star Wars movie, I don't know if he's using it correctly or not, but I know those fanboys out there fuck this one up often enough.
A league is also distance, not a depth. Stupid movie titles aside. Seeing as 20K leagues is about 111,000km, I think it's be pretty rough to be down that far. Since you know, you'd come out the other side of the planet.
For depth, you probably want fathoms (6 feet). Of course, 20K fathoms is 36 km and the Marianas trench is 11 km, so it's still wrong. But hey, at least it's in the right ballpark.
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