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To: Zuben Elgenubi; Rocky; mikrofon; Procyon; Rodamala; Textide

http://scienceblogs.com/startswithabang/2009/08/26/why-our-analemma-looks-like-a/

[snip] So, at the North Pole, the analemma would be completely upright (an 8 with the small loop at the top), and you’d only be able to see the top half of it. If you headed south, once you drop below the Arctic Circle, you’d be able to see the entire analemma, and it would start to tilt to one side the closer to the horizon you photographed it. By time you got down to the equator, the analemma would be completely horizontal. Then, as you continued to go south, it would continue rotating so that the small loop was beneath the large loop in the sky. Once you crossed the Antarctic Circle, the analemma, now nearly completely inverted, would start to disappear, until only the lower 50% was visible from the South Pole. [/snip]


13 posted on 12/22/2013 2:14:32 PM PST by SunkenCiv (http://www.freerepublic.com/~mestamachine/)
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To: SunkenCiv

That’s a great reference, thanks SC!

I remember when in Australia years ago getting thrown by the different appearance of familiar constellations, and just the motion in the sky of celestial objects.


14 posted on 12/22/2013 2:27:24 PM PST by mikrofon (I should recall Kepler's Laws, but it's been awhile since I went Kepling....)
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To: SunkenCiv; All
This gif is interesting in that it demonstrates directly the use of Lissajou Curves, which as a Mechanical Engineering major, I used in lab experiments with oscilliscopes and frequency generators to get accurate frequency readings for high speed cyclical events.


15 posted on 12/22/2013 4:52:45 PM PST by Rodamala
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