Analemma from San Pedro Garza García, Mexico

January 21, 2019

ANALEMA FINALE Dic 21 2018 (1)

Photographer: Cesar Cantu Quiroga 
Summary Authors: Cesar Cantu Quiroga; Jim Foster

The image of the analemma featured above was a project that I started on December 21, 2017, when I first began taking a daily image of the Sun, for an entire year, at 17:00 hours (5:00 pm) from my home near San Pedro Garza García, Mexico. The offset figure 8 is formed by the changing position of the Sun during the year with respect to my location. The image consists of 53 separate photographs -- only cloud-free, smog-free and air pollution-free images were used. Note that the biggest gaps occur between April 19 and April 29 (top part of the 8 and between October 10 and October 23 (bottom portion of the 8).

Since the photos were all taken in the late afternoon and since my location is much closer to the Equator than to the North Pole, the 8 is slanted noticeably to the right. The top photo of the Sun represents the Northern Hemisphere's summer solstice; whereas the bottom photo represents the winter solstice. Shown below is the Sierra Madre Oriental range.

Photo Details: Camera: Canon EOS 5D Mark III with 14 mm Rokinon lens; Software: Adobe Photoshop CC 2018 (Windows); Exposure Time: 0.040s (1/25); ISO equivalent: 100.



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