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Posted by Marc Christiansen on 12/05/07 16:38
Tim Streater <tim.streater@dante.org.uk> wrote:
> 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 5.87849981Ã?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 5.87849981Ã?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.
You're right. I was mixing up lightyears per fortnight as a unit, and
the speed one lightyear per fortnight. So, self caused confusion...
Marc
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