Re: Federation: 8,000 ly across?
^Isn't that like saying 50mph in the UK is different than 50mph in the US. Sure what one species calls warp 5 might be a different velocity than what another species calls Warp 5.
But Federations ships would have uniformity, when using the same scale. And given that TNG/DSN and VOY were all set within the same time frame a span of some 15 or so years for the TV shows. With no indication that the scale was recalibrated.
On the continent of wild endeavour in the mountains of solace and solitude there stood the citadel of the time lords, the oldest and most mighty race in the universe looking down on the galaxies below sworn never to interfere only to watch.