Flight path of SO/PHI (blue lines) relative to the Sun (black cross) and SDO/HMI (red cross) over the observation periods of P1, P2, and P3 as seen from above the north pole of the Sun. From this perspective, SO/PHI is moving anti-clockwise about the Sun towards the Sun-SDO/HMI line (black line) and the angle subtended by SO/PHI and SDO/HMI from the Sun represents the separation in heliographic longitude. The solid grey lines mark the annotated angular distances and the dashed grey lines the annotated distances from the Sun. The separation in heliographic latitude, hidden in this perspective, is relatively minute, ranging from 3.7° to 7.6°. Simultaneous SO/PHI and SDO/HMI magnetograms from 05.09.2021 and 09.09.2021 (blue plus symbols) are depicted in Fig. 4.