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Astronomy Picture of the Day -- Solargraphy Analemmas
NASA ^ | March 20, 2014 | (see photo credit)

Posted on 03/20/2014 8:28:14 PM PDT by SunkenCiv

Explanation: Today is the equinox. The Sun crosses the celestial equator heading north at 16:57 UT, marking the northern hemisphere's first day of spring. To celebrate, consider this remarkable image following the Sun's yearly trek through planet Earth's sky, the first analemmas exposed every day through the technique of solargraphy. In fact, three analemma curves were captured using a cylindrical pinhole camera by daily making three, separate, one minute long exposures for a year, from March 1, 2013 to March 1, 2014, on a single piece of black and white photographic paper. The well-planned daily exposures began at 10:30, 12:00, and 13:30, CET from a balcony looking south from the Kozanów district in Wrocław, Poland. That year's two equinoxes on March 20 and September 22 correspond to the mid-points, not the cross-over points, along the figure-8 shaped curves. Apparent gaps in the curves are due to cloudy days. Two solid lines at the lower left were both caused by a timer switch failure that left the pinhole shutter open.

March 20, 2014

(Excerpt) Read more at 129.164.179.22 ...


TOPICS: Astronomy; Astronomy Picture of the Day; Science
KEYWORDS: analemmas; apod; astronomy; science
[Credit & Copyright: Maciej Zapiór and Łukasz Fajfrowski]

1 posted on 03/20/2014 8:28:14 PM PDT by SunkenCiv
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To: brytlea; cripplecreek; decimon; bigheadfred; KoRn; Grammy; married21; steelyourfaith; Mmogamer; ...
When life gives you Analemmas, make Analemmanade.
The Big One

2 posted on 03/20/2014 8:29:11 PM PDT by SunkenCiv (https://secure.freerepublic.com/donate/)
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To: SunkenCiv

sounds like a medical procedure.
(cough)


3 posted on 03/20/2014 8:36:58 PM PDT by NormsRevenge (Semper Fi - Revolution is a'brewin!!!)
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To: SunkenCiv
Thanks for posting. First saw this with the sun phases a week or so ago. Great pics. Have the star trails as my current background:

Warped Sky: Star Trails over Arches National Park

4 posted on 03/20/2014 8:42:50 PM PDT by mykroar (We fight, get beat, rise, and fight again. - Nathanael Greene)
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To: mykroar

THAT is way cool..


5 posted on 03/20/2014 8:51:57 PM PDT by castlebrew (Gun Control means hitting where you're aiming!))
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To: mykroar

Trippy.


6 posted on 03/20/2014 9:05:50 PM PDT by Army Air Corps (Four Fried Chickens and a Coke)
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To: SunkenCiv
More about analemmas than you ever wanted to know: http://www.analemma.com/Pages/framesPage.html
7 posted on 03/20/2014 9:08:05 PM PDT by KarlInOhio (Republican amnesty supporters don't care whether their own homes are called mansions or haciendas.)
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To: KarlInOhio

I know a lot more than that. Rest assured!


8 posted on 03/20/2014 10:55:09 PM PDT by dr_lew
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To: SunkenCiv

Thank you for the post and ping.

Good thing I never tried that. Ohio has the most overcast days of all the states save Washington. I might have a half dozen points on my Analemmas.

It is really nice to see the Sun’s path like that. The Earth does wriggle around a bit, doesn’t it.


9 posted on 03/21/2014 5:26:00 AM PDT by TheOldLady
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To: TheOldLady

Yup, never the same thing twice.


10 posted on 03/21/2014 5:48:52 AM PDT by SunkenCiv (https://secure.freerepublic.com/donate/)
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To: KarlInOhio

I think I went to school with Ana Lemma...


11 posted on 03/21/2014 6:48:11 AM PDT by SunkenCiv (https://secure.freerepublic.com/donate/)
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