Solarigraphy
(solargraphy)
This method is based on a self-developing process in the photographic paper emulsion when it is extremely overexposed. Usually, the portable camera Obscura with a pinhole as a "lens" is installed for several days, weeks, months, or even years to get the picture. During the long exposure, the Sun rays and objects that are not moving relative to the camera are fixed on photo paper. The camera gets the Sun paths in the sky when it is mounted to the fixed object. When it is installed on the moving object, this object is shot clearly, and other objects are blurred.