Seasonal Shift of the Setting Sun
Taken by Alan Dyer on December 21, 2019 @
near Gleichen, Alberta
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Camera Used: NIKON CORPORATION NIKON D750
Exposure Time: 1/125
Aperture: f/5.0
ISO: 100
Date Taken: 2019:12:21 17:29:50
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Details:
This demonstrates the shifting sunset point through the seasons.
This is a 3-image blend of images taken at the March 20, 2019 Equinox (centre), the June 22, 2019 Summer Solstice (at right, or technically the day after solstice), and at the December 21, 2019 Winter Solstice (at left). All were taken from the same location and with the same camera and lens.
The composite shows the changing position of the sunset point, from far to the northwest at right in summer, to due west at centre at the equinoxes, and far to the southwest at left at the winter solstice. Snow covered the field in March and December but was green field in June with the crop just starting to grow.
This is from a latitude of 51° N from southern Alberta. From farther north the shift would be even more pronounced. Here at this latitude ther change in azimith is about +/- 40° — i.e. 40° south of due west at the winter solstice and 40° north of due west at the summer solstice. The Sun sets due west only at the two equinoxes.
I shot the March vernal equinox for this demo, as the sky was too cloudy to include the September autumnal equinox Sun. As it was, clouds on the horizon prevented a clear view of the setting Sun at the two solstices, but the bright sunset points are still apparent.
All were with the Nikon D750 and Sigma 14mm Art lens, blended in Photoshop with gradient masks.
Photographer's website:
https://www.amazingsky.net
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