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Date: 07 Aug 2006 22:19:58
From: subhash
Subject: Questions about annual aberration and annual parallax of stars
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Dear Members,
Please help me to reply the following -
The measurement of the major axis of the ellipses formed by stellar
aberration and parallax by taking the positional photographs in the
observatories of the star under consideration time to time in the
duration one year then the major axis are majored of both the ellipses
given the value of stellar aberration and parallax respectively. The
value of the major axis of aberrational ellipse is 20.47 as a constant
for all the stars while the value of the parallax ellipse changes star
to star. The maximum value being .772 arc-second for the nearest star
Proxima Cen while this value is different for other distant stars. The
distances of the stars is calculated as 1/parallax arc-second.
Now my problem is the value of major axis for the aberrational ellipse
is perfectly constant 20.47 for each star(it is true mathematically but
I want to know experimentally) or it varies by slight values if it
varies then what is the lower and upper limit of variation.
I will be much oblidged for the reply or the suggestion that where can
I get the proper detailed answer.
With deep regards,
S.C. Jain
e-mail ID-scjain108@yahoo.com
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Date: 08 Aug 2006 02:49:07
From: oriel36
Subject: Re: Questions about annual aberration and annual parallax of stars
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An entire article about what was once the Equation of Light and not a
single mention of the method and discovery of Ole Roemer !.
It is quite understandable but then again,an article which goes out of
its way to promote the 'scientific method' could always filter out the
history of discovery or twist it to suit its own spurious ends.
Sam Wormley wrote:
> subhash wrote:
> > Dear Members,
> > Please help me to reply the following -
> > The measurement of the major axis of the ellipses formed by stellar
> > aberration and parallax by taking the positional photographs in the
> > observatories of the star under consideration time to time in the
> > duration one year then the major axis are majored of both the ellipses
> > given the value of stellar aberration and parallax respectively. The
> > value of the major axis of aberrational ellipse is 20.47 as a constant
> > for all the stars while the value of the parallax ellipse changes star
> > to star. The maximum value being .772 arc-second for the nearest star
> > Proxima Cen while this value is different for other distant stars. The
> > distances of the stars is calculated as 1/parallax arc-second.
> > Now my problem is the value of major axis for the aberrational ellipse
> > is perfectly constant 20.47 for each star(it is true mathematically but
> > I want to know experimentally) or it varies by slight values if it
> > varies then what is the lower and upper limit of variation.
> > I will be much oblidged for the reply or the suggestion that where can
> > I get the proper detailed answer.
> > With deep regards,
> >
> > S.C. Jain
> > e-mail ID-scjain108@yahoo.com
> >
>
> See: http://en.wikipedia.org/wiki/Aberration_of_light
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Date: 08 Aug 2006 05:32:00
From: Sam Wormley
Subject: Re: Questions about annual aberration and annual parallax of stars
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subhash wrote:
> Dear Members,
> Please help me to reply the following -
> The measurement of the major axis of the ellipses formed by stellar
> aberration and parallax by taking the positional photographs in the
> observatories of the star under consideration time to time in the
> duration one year then the major axis are majored of both the ellipses
> given the value of stellar aberration and parallax respectively. The
> value of the major axis of aberrational ellipse is 20.47 as a constant
> for all the stars while the value of the parallax ellipse changes star
> to star. The maximum value being .772 arc-second for the nearest star
> Proxima Cen while this value is different for other distant stars. The
> distances of the stars is calculated as 1/parallax arc-second.
> Now my problem is the value of major axis for the aberrational ellipse
> is perfectly constant 20.47 for each star(it is true mathematically but
> I want to know experimentally) or it varies by slight values if it
> varies then what is the lower and upper limit of variation.
> I will be much oblidged for the reply or the suggestion that where can
> I get the proper detailed answer.
> With deep regards,
>
> S.C. Jain
> e-mail ID-scjain108@yahoo.com
>
See: http://en.wikipedia.org/wiki/Aberration_of_light
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