Circumpolar - Star trails around north celestial pole - Photographic pose around the polar star....

Circumpolar - Star trails around north celestial pole - Photographic pose around the polar star. Organ Pipe National Monument, Aizona, USA. The setting for this star trails photo is the pristine desert landscape of the Organ Pipe National Monument in Southern Arizona. The cactus in the foreground is a 25 foot tall Seguaro. Star trails are made by the combination of: the spinning of the Earth, the use of a stationary mount or tripod and a long exposure of the film. As the Earth spins, the stars begin to make concentric circles on the photograph. The closer stars are to Polaris, our North pole star, the smaller their circles. Thar farther away they are, the larger their circles