[amsat-bb] Re: [SPAM] Re: Dont loose the north

[Andrew Rich]

Thats awesome - so stars follow a circular track, and other objects from a
line ?


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Andrew Rich VK4TEC
vk4tec at people.net.au <mailto:vk4tec at people.net.au>
http://www.tech-software.net




-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org]On
Behalf Of Tom Clark, K3IO
Sent: Monday, 31 December 2007 4:02 PM
To: AMSAT BB
Subject: [SPAM] [amsat-bb] Re: Dont loose the north
Importance: Low


With all this discussion about Polaris, I thought you might find a
couple of photos I took back in 2002 that shows you that the earth's
spin axis is close to, but not precisely at Alpha UMi. Take a look at
http://www.pbase.com/tomcat/aurora. The right-hand picture
(http://www.pbase.com/tomcat/image/5186538)shows how the stars move over
about 4 hours. The star nearest the center of the arcs is Polaris; if it
was precisely at the pole, then the arc would have been a point.

You may also find the animated GIF photos of a (relatively) rare
low-latitude (Maryland) Aurora interesting.

73 & Happy New Year -- Tom
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