[amsat-bb] Re: Dont loose the north
nss at mwt.net
Sun Dec 30 07:39:08 PST 2007
For those that want to actual;ly find it here is a cool page with an
actual photo of the area of sky. and when you place your mouse over the
words mouseover it gives you guide lines too,
or here is another
Luc Leblanc wrote:
>Thank's for those who correct me The north star is in Ursa minor constellation
>(not major) and for the half a degree or one error from the real north pole but
>as stated we can live with it and i should wrote also to be able to confirm the
>north with a GPS you should move away from your point towards Polaris this way
>your GPS will show you a direction pointing to the star.
>As my main topic was about not loosing the north... that's the minimum i can
>wished you all in 2008. I am not too sure if wishing an Happy New Year is still
>relevant? Should we wished us all a better new year instead? In french we
>wished us good and happy new year (freely translated) a bit more realistic but
>lets say the goals are the same only the means differs.
>Here is some help to understand the North Star.
>Today the Earth's axis points within one degree of Polaris, the brightest star
>in the constellation Ursa Minor (also called the Little Bear or the Little
>Dipper). Polaris appears to be in a fixed position in the sky throughout the
>year. All other stars and constellations seem to revolve around the North Star.
>In the case of the earth, precession is caused by the gravitational pull of the
>sun and the moon. The earth's axis makes one complete rotation over the course
>of approximately 26,000 years. If you trace the path of the axis in the sky,
>you will find that Polaris, Vega, Thuban, and Alpha Cephei all fall on or very
>close to it. So when the earth's axis is at a point on the path near Vega, Vega
>becomes the North Star while Thuban is the North Star when the axis is near it
>on the path.
>Five thousand years ago, Thuban was the North Star. Five thousand years from
>now, the North Star will be Alpha Cephei. Seven thousand years after that, it
>will be Vega. Nine thousand years after that, Thuban will be the North Star
>again. At these dates, the various stars will be at the closest to absolute
>north. For some time before, the relevant star will be approaching due north
>and it will be receding for some time after the time listed. In these interim
>times, the North Star is whichever star is closest to north.
>P.S. The North pole cap is melting too...just a reminder when you will give
>your new year wishes! As i said don't loose the North ;)
>Luc Leblanc VE2DWE
>WAC BASIC CW PHONE SATELLITE
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