Solargraph
A solargraph is a long-exposure photograph that captures the Sun's path across the sky over extended periods, often weeks or months. Utilizing a simple pinhole camera, such as one made from an aluminum can lined with photographic paper, solargraphs record continuous solar trails, revealing the Sun's movement and seasonal changes.
Source: apod.nasa.gov
APODs including "Solargraph"
45 Days in the Sun
21/02/2015
From January 11 to February 25 2013, a pinhole camera sat in a field near Budapest, Hungary, planet Earth to create this intriguing solargraph. And for 45 days, an old Antonov An-2 biplane stood still while the Sun rose and set. The camera's continuous exposure began about 20 days after the northern hemispere's winter solstice, so each day the Sun's trail arcs steadily higher through the sky. These days in the Sun were recorded on a piece of black and white photosensitive paper tucked in to the simple plastic film container. The long exposure produced a visible color image on the paper that was then digitally scanned. Of course, cloudy days left gaps in the solargraph's Sun trails.