Mark McGillivray submitted this image to EarthSky. He wrote:
This is a solargraph, taken as one single continuous exposure between March 13 and June 20, 2018, using a homemade pinhole camera constructed from a beer can. The image was taken at The Kelpies, in Falkirk, Scotland – the world’s largest equine sculptures – and shows the movement of the sun across the sky each day of the exposure.
On solargraphs, the streaks come from the fact that the sun’s path shifts from day to day, as it moves from equinoxes to solstices, and solstices to equinoxes.
Thank you, Mark!
By the way, we received another photo last year from a photographer who was using a beer can as a pinhole camera, in this case to capture the total solar eclipse of August 21, 2017. He describes his process here.
And we also received another solargraph, this one from the winter solstice 2017 to the June solstice 2018:
Bottom line: Solargraphs tracking the shifting path of the sun across the sky, ending at the June solstice 2018!
Deborah Byrd created the EarthSky radio series in 1991 and founded EarthSky.org in 1994. Today, she serves as Editor-in-Chief of this website. She has won a galaxy of awards from the broadcasting and science communities, including having an asteroid named 3505 Byrd in her honor. A science communicator and educator since 1976, Byrd believes in science as a force for good in the world and a vital tool for the 21st century. "Being an EarthSky editor is like hosting a big global party for cool nature-lovers," she says.