Toronto. Shades of pinhole photography! Madeleine Muzdakis wrote this article for “Modern Met” on December 15, 2020. The article, “University Discovers Photo With 8-Year-Long Exposure That Was Taken With a Beer Can“, describes the technique used.
The article begins, “The London 2012 Summer Olympics had its closing ceremonies in August 2012.
“Just one week after the athletes dispersed, a masters student in fine arts began a project at the University of Hertfordshire in the UK. Regina Valkenborgh crafted a pinhole camera out of an aluminum beer can, duct tape, and light-sensitive photographic paper.
“Affixed facing skyward on the side of the university’s Bayfordbury Observatory, the camera was forgotten—weathering the elements for eight years and one month. David Campbell—the observatory’s Principal Technical officer—finally got around to removing the camera this fall.
“Inside, he discovered the longest-exposure image ever captured, showing eight years’ worth of solar paths across the sky.”
My thanks and a tip of the hat to good friend and fellow PHSC member Russ Forfar deep in the snow and woods of Central Ontario.