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ROSAT's solar panels stay fixed with respect to the XRT axis (see Figure 2.1 ). In order to maintain sufficient power supply the solar panels must always be pointed within a cone around the Sun. Consequently, the sky accessible to ROSAT at any given time is a band perpendicular to the solar vector; this corresponds to approximately 26 percent of the whole sky. Due to the solar motion, this viewing swath covers the whole sky in a period of six months. Targets in the vicinity of the plane of the ecliptic can be observed twice a year for about 30 days, whereas targets in the vicinity of the poles of the ecliptic can be observed at all times.