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Baku Analemma

By: Tunc Tezel

 

Region: Asia

Site: Baku - Azerbaijan

Date: 2011-2012

Comments: 8

As seen on Astronomy Picture of the Day, one full year of solar motion is captured in this multi-exposure analemma image from shore of the Caspian Sea in Baku, Azerbaijan (See this image in a flash animation that shows how the analemma forms). Analemma is the figure "8" loop that results when one observes the position of the sun at the same time of day over the course of a year. The 23.5 tilt of the earth's axis of rotation and its elliptical orbit about the sun result in the apparent change in the sun's location in the sky when observed at the same location at the same time of day over a year's time. For this image the photos are all made during the local noon. The highest point shows the sun near the day of Summer Solstice (June 21) and the lowest marks the shortest days near the Winter Solstice (Dec. 21).

Explained the photographer: "After moving to Baku in December 2011, I had quickly realized that the city was no good for TWAN imaging because of its excessive light pollution. So, I decided to take on daytime imagery instead, an analemma project. I first completed a sunrise analemma which were photographed between April and September 2012, and was in fact the second analemma work after my Tutulemma back in 2006. This noon analemma project, appears here, started before the second one and ended after it. From a spot I marked on the sidewalk of my job site, I shot 5-panel all-sky panoramas every 7~10 days. The shooting time was 12:40 local time (GMT+4) or 13:40 summer time (GMT+5) corresponding to local noon in Baku. I started shooting the first one on 14th December 2011 and shot the last set on 6th December 2012. I used a 8 mm f/3.5 circular fisheye lens, which is normally enough for a single shot all-sky picture. But the Peleng lens I use loses sharpness along the edges, so I went for 5-panel panoramas. I did not use any kind of filter to block the Sun and at this shooting made a series for HDR processing instead. So, every imaging day needed shooting of 18 separate pictures to be processed later. That is why it took 4 months for me to get this final picture, after completion of shooting back in December. So, here it is; an all-sky, high (and low) noon analemma." Tunc Tezel

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