Illustrating the effect of parallax on stellar images in the preceding (p) and following (f) field of view of Gaia, when the Sun is in two different positions (s1 and s2) relative to the stars. z is the spin axis of Gaia, and the basic angle is marked between the two fields of view. The displacement due to parallax is always directed towards the Sun, as indicated by the thick arrows at p and f, and is measured by Gaia as projected along the scanning great circle. See Sect. 2 for further explanation.
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