Deep green & the turning of the earth
»Deep green & the turning of the earth« is a documentation of the rotation speed of the earth. The photographs are multiple exposed (3 or 4 times) with a pinhole-camera. At the equator, the circumference of the earth is 40,070 kilometers, and the day is 24 hours long so the speed is 1670 kilometers/hour (1070 miles/hr). This decreased by the cosine of the latitude of a certain place is the formula to find the speed of any location.
I am currently living an working in Regensburg Germany. The exact speed/distance the earth turns here is: 1095,29 km/hour = 18,25 km pro minute, 304 m pro second, 76 m pro 1/4 of a second. By fractioning the time I can translate the movement to shuttertimes of the camera. In between the exposures I move the camera in the opposite direction of the turning direction of the earth (the earth turnes east) at the distance that fits the exposure-time. For example: I choose an exposure time of 1 full second, after the exposure I move the camera 304 m to the west, here I make the next exposure of the same piece of film. Depending on the available light I make thee to four exposures on the same piece of film. In this way the photo shows the three or four ‘earth-rotation-exposures’ as if flying in the air and documenting the earth surface.