Posted on 09/20/2012 3:46:22 AM PDT by SunkenCiv
Explanation: An analemma is that figure-8 curve that you get when you mark the position of the Sun at the same time each day throughout planet Earth's year. In this case, 17 individual images taken at 0231 UT on dates between April 2 and September 16 follow half the analemma curve, looking east toward the rising sun and the Caspian sea from the boardwalk in the port city of Baku, Azerbaijan. With the sun nearest the horizon, those dates almost span the period between the 2012 equinoxes on March 20 and September 22. The northern summer Solstice on June 20 corresponds to the top of the figure 8 at the left, when the Sun stood at its northernmost declination. Of course, this year the exposure made on June 6 contained a little something extra. Slightly enhanced, the little black spot on the bright solar disk near the top of the frame is planet Venus, caught in a rare transit during this well-planned sunrise analemma project.
(Excerpt) Read more at 129.164.179.22 ...
[Credit & Copyright: Tunç Tezel (TWAN)]
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Like the path of a cosmic Frisbee.
Thanks!
I learned a new term, and I have a new long term project to try this at home.
I LIKE it!
With friends like you, who needs analemmas ?
;’)
I love the Venus twist. Yes, this display was well planned indeed. Lovely picture.
But I thought that the Sun’s or the Moon’s looking larger at the horizon rather than up higher in the sky was an optical illusion that does not show up on film. But I actually measured the diameter of the sun on the horizon against the highest orb, and it actually is bigger at the horizon. Sigh... Another thing I was positive I knew, blown to smithereens.
The Sun’s apparent diameter changes with the time of the year, due to the Earth’s elliptical orbit; we’re closest in January and furthest in July, which means that n hemisphere’s summer is a little cooler while s hemisphere’s winter is also a little colder; and our winter is a little warmer while their summer’s a little hotter. That doesn’t explain Antarctica of course, but it’s still interesting.
Oh, and the Moon’s apparent diameter changes for the same reason, the difference between apogee and perigee (and I can’t ever keep them straight) is about 13, 000 miles, or a bit more than 5 percent.
Thank you, my friend. That did occur to me - after I posted. [blush]
Heck, I even have a picture of the moon with perigee and apogee hemispheres side by side. Somewhere in Photobucket...
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