Relative positions among the Sun, the Earth (SDO), and SO on 2021 September 14. The orange circle represents the observed object (the Sun). The red circle represents the position of Solar Orbiter, which is about 0.59 AU away from the Sun. The blue circle represents the position of SDO, which is an Earth-orbiting satellite and is 1 AU away from the Sun. The angle between the Sun-Earth line and the Sun-SO line is about 48°. The sizes of the objects are not in scale.