Time dependence of the angle between Jupiter’s direction and the spin axis of the Planck spacecraft. The darker horizontal bar indicates the angular region of the 11 LFI beam axes, while the lighter bar is enlarged by ± 5°. Saturn, Uranus, and Neptune show a similar pattern. The labels SS1…SS8 denote Planck sky surveys, as defined in Planck Collaboration V (2016), from which the figure is taken. Tr1…Tr7 denote the transits; letters T and L indicate whether it was a trailing or leading transit, according to Fig. 1.