Fig. 1.
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Overview of the Gaia scanning law. Left: during the nominal scanning law, the spin axis z makes overlapping loops around the Sun at a separation of 45° and rate of 5.8 cycles yr−1. Right: one source at point a may be scanned whenever z is 90° from a, that is, on the great circle A at z1, z2, z3, etc. Reproduction with permission of Fig. 7 in Gaia Collaboration (2016).
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