Because of the shape of a catenary-tent-collector, a self-shading effect occurs on one of its sides (side B in Fig. 2). In this article we analyze the shadow shape and area. Based on these results, the beam insolation on the collector is calculated. We also determine the diffuse and the albedo insolation on the collector. An example for the planet Mars is given in Appendix B. Shadow Calculation The catenary-tent-collector is self shading. The size of the shadow and the side which is shaded depend on the sun position. In general, both sides of the collector will be alternately shaded in a given day if at sunrise The azimuth angles are measured from true south positively in a clockwise direction. In days when eq. (3) is not satisfied, only one side of the collector is shaded at all the time. In this paper we analyze the shape and size of the shadow cast on the catenary-tent-collector facing in a south-north direction. The results can be generalized for an arbitrary oriented tent by replacing the sun azimuth angle ys by the difference between the solar and the collector azimuth angles, i.e.
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