Solar-Analemma: when solargraphy meets astronomy.
Solargraphy analemma. Exposure time: March 1, 2013 - March 1, 2014. Cylindric solargraphy camera. Three analemmas recorded at 10:30, 12:00, 13:30 (CET) are visible. Solid lines in the lower left part of the image were caused by a time switch failure, which left the shutter opened. Solid lines on the right arises from the afternoon additional exposure. Image obtained using the "set 1".
Solargraphy analemma. Exposure Time: March 1, 2013 - March 1, 2014. Cuboid solargraphy camera. Three analemmas recorded at 10:30, 12:00 and 13:30 (CET) are visible. Image obtained using the "set 3".
Solargraphy analemma. Exposure time: March 1, 2013 - March 1, 2014. Cylindric solargraphy camera. The part of the analemma at 12:00 (CET) is visible. Solid lines on the left and right arose from the special supplementary exposition. The shutter was open from sunrise to 11:00 and from 13:00 to sunset of the sun. Low contrast in the lower part of the image, due to the relatively strong light coming from the sky, does not allow for reveal the bottom part of the analemma. The second analemma (recorded at 13:00) is visible because of the special operation of the mechanism. The mechanism opened the shutter for 1 minute, then closed it for 5 minutes and then was keeping it opened to sunset. Note the quasi-analemma formed by the ends of the solar trails on the left side of the image. They were created because the shutter was closing at 11:00. Three trails of the Sun at the top of the analemmy were caused by the switch failure. Image obtained using the " set 2".
