Re: Reconsidering Halton Arp

>And it occured to me today to wonder which he was referring to.  Was much 
>of a distinction made in Aristotle's day between velocity and 
>acceleration?

Of course not! The concept of acceleration would have been quite outside
of the mindset of that time. In particular, you could only consider
ratios of like things, eg. lengths and lengths, times and times.
Doing even a velocity (ratio of length and time) was stretching
things. Usually for 'constant velocity' they said something about
the ratio of the lengths traveled and the ratio of the times taken
being equal.

It wasn't really until Oresme in the 14th century that even constant
acceleration was thought about. And Oresme was way ahead of his time.

--Dan Grubb