Hello :) Solargraphy is a type of pinhole photography where the movement of the sun across the sky is captured using extremely long exposures.
To do this, you need to make a solargraph camera, usually from aluminum cans, but any suitable metal container will work. A tiny hole is made in the side of the can with a fine needle (there are formulas to calculate the diameter), and black-and-white light-sensitive photographic paper is loaded inside.
This solargraph can/camera is then set up with a view of the sun and left for a period ranging from several weeks to several months. Because the light sensitivity of the photographic paper is very low, around ISO 2, it doesn't get overexposed over such a long period, and it records the sun's tracks along with stationary objects. That's basically how simply it all works :)
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To do this, you need to make a solargraph camera, usually from aluminum cans, but any suitable metal container will work. A tiny hole is made in the side of the can with a fine needle (there are formulas to calculate the diameter), and black-and-white light-sensitive photographic paper is loaded inside.
This solargraph can/camera is then set up with a view of the sun and left for a period ranging from several weeks to several months. Because the light sensitivity of the photographic paper is very low, around ISO 2, it doesn't get overexposed over such a long period, and it records the sun's tracks along with stationary objects. That's basically how simply it all works :)
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