The entrance windows to each of the experiments see approximately 8x8 degrees, and as the spacecraft spins, it accumulates enough time looking at a specific spot in the sky so that its sensors can register a detectable signal and measure its intensity. Its like sitting on a merry-go-round and opening and closing your eyes once per rotation for a few seconds. You will see the same general piece of the scenery each time, and the satellite data, combined with detailed pointing information, lets the scientists reconstruct the scenery from the signals they receive.
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