Re: Pseudo-science

In message <1148069858.883197.28140@xxxxxxxxxxxxxxxxxxxxxxxxxxx>, mccoy@xxxxxxxxxx writes

Ernest Major wrote:
In message <1147724254.977838.209470@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
mccoy@xxxxxxxxxx writes
>
>True. You can tell what chemical composition they are made of, the
>speed and velocity of rotation of each star, where they have been and
>where they are going, etc.
>
Congratulations on your acceptance that we can tell how distant stars
are.

Never said that. It only tells us where they have been in relation to
each other. It's just a matter of photographic material and nothing
else.

JM


You may not have meant to say it, but it's implicit in what you said - if you don't know how far away they are you don't know where they are in relation to each other.

Even if you meant historical changes in the right ascension and declination of the stars, rather than their positions in space, it is necessary to know the distances and radial velocities to plot these.

In particular Arcturus has a high velocity relative to the Sun. Because of this it is not possible to just extrapolate its proper motion across the celestial sphere. You need to know its distance to plot its past and future path across the constellations.
--
alias Ernest Major


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