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Posted by Tim Streater on 12/05/07 15:08
In article <o7mi25-le8.ln1@pluto.solar-empire.de>,
Marc Christiansen <usenet@solar-empire.de> wrote:
> Jerry Stuckle <jstucklex@attglobal.net> wrote:
> > Marc Christiansen wrote:
> >> Jerry Stuckle <jstucklex@attglobal.net> wrote:
> >>> Marc Christiansen wrote:
> >>>> Jerry Stuckle <jstucklex@attglobal.net> wrote:
> >>>>> Toby A Inkster wrote:
> >>>>>>
> >>>>>> ____
> >>>>>> 1. It is noteworthy that the UK's motorway speed limit (70
> >>>>>> miles/hour) is almost exactly 4 millilightyears per fortnight
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> >>>>>> (it's about 4.0009353).
> [...]
> >>> But you're wrong - you need to divide 5.87849981×10^12 by 365 to get the
> >>> number of miles in a light day, then multiply by 14 days.
> >>
> >> Only if you want the length of a light fortnight in miles. Which is not
> >> the same as lightyear / fortnight. Light fortnight is a length,
> >> lightyear / fortnight is a velocity.
> >>
> >>> I have no idea where you got 5.87849981×10^12 / (14 * 24). But one
> >>> light hour is 670,616,629 miles or so.
> >>
> >> 14 * 24 is the number of hours in a fortnight, so dividing the length of
> >> one lightyear in miles by this number gives me one lightyear / fortnight
> >> in miles / hour.
> >
> > OK, but he wasn't looking at one lightyear per fortnight (which violates
> > most current laws of physics). He was looking at a light fortnight -
> > the distance light travels in a fortnight.
>
> Huh? Diving a length by a time span violates laws of physics, just
> because the length is expressed in lightyears or the time span in
> fortnights? And he was talking about "millilightyears per fortnight" and
> the speed limit on UK's motorways, so he definitely did not mean a
> distance.
>
> Marc
One lightyear per fortnight is presumably 26 times the speed of light.
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