TL;DR: Eight years of sun arcs were captured using long exposure solargraphy [1] at a teaching observatory near London. The pinhole camera was forgotten and lef

TL;DR: Eight years of sun arcs were captured using long exposure solargraphy [1] at a teaching observatory near London. The pinhole camera was forgotten and left out longer than the typical 6-12 months. [1] https://en.wikipedia.org/wiki/Long-exposure_photography#Solargraphy https://en.wikipedia.org/wiki/Long-exposure_photography#Sola...