Re: 1971 Time dilation plane experiment looks flawed

From: Bill Hobba (bhobba_at_rubbish.net.au)
Date: 02/09/05 

Date: Wed, 09 Feb 2005 01:12:36 GMT

<guskz@hotmail.com> wrote in message
news:1107904956.253482.70110@z14g2000cwz.googlegroups.com...
>
> http://hyperphysics.phy-astr.gsu.edu/hbase/relativ/airtim.html
>
> 1. Two planes left at the same speed off the surface of Earth but their
> time dilation is not calculated from the surface of Earth because Earth
> is also moving(spinning) but instead the calculations are based on the
> CENTER of Earth as the Inertial Reference Frame. (They called it
> kinematic time dilation)
>
> 2. It seems that if they left off the surface of Earth, therefore the
> Time dilation should be measured from the location of separation
> (Surface) and not the center of Earth.
>
> 3. As well who says the center of Earth is not also moving (opposite to
> Inertial)

??????? - Opposite to inertial? All inertial frames are equivalent.

> like the surface of Earth since the Earth is spinning about
> the Sun and both may be moving quite fast within the Universe and even
> the Universe may be moving....

The assumption is the center of the earth is stationary in some inertial
frame - the fact the earth rotates etc makes no difference to the fact that
the center of the earth is stationary in an inertial frame if you
specifically consider a coordinate system where it is.

>
> Even the clock on the surface of the Earth exibited a time dilation by
> calculations with relations to the center of the Earth.
>

It exhibited time dilation due to the fact it is in a gravity well. Such is
not present when considering the centre of the earth is stationary in an
inertial frame - if you are far enough away from the earth. Now not having
seen the detail of the calculations you are doubting I can not be sure but I
would suggest if the effect of gravity were ignored it was because they
would have made negligible corrections.

>
> So why stop at only the center of the Earth...why not the Sun or the
> Universe as Inertial Reference Frames to determine time dilation???

Since all inertial frame are equivalent we can choose any we like - the one
where the center of the earth is stationary is simply convenient. In fact
it may not be strictly inertial - but I have no doubt, for the calculations
being considered, any deviations would be negligible.

I have read a couple of your posts ands honestly I think you are very
confused about quite fundamental things. You should get then straight
before criticizing a theory.

Bill

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