EDP Sciences
Gaia Data Release 1
Press Release
Free Access

Fig. 7

image

Spin axis z makes loops around the Sun, which must overlap. A star at point a may be scanned whenever z is 90° from a, i.e. on the great circle A at z1, z2, z3, etc. The scans intersect at a large angle, which allows the determination of two-dimensional object coordinates from one-dimensional measurements. Image courtesy Lennart Lindegren.

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