Untergegensonnenbogen (EE63)

The subanthelic arc resembles the heliac arc in appearance. However, it lies in the region of the anthelion. It is colorless and crosses the subanthelion (EE30), which lies at the antisolar point below the horizon. The loops of the heliac arc and the subanthelic arc touch at the sun's meridian in the vicinity of the zenith. Previous observations have been made in Antarctica, from Finnish lamp-ice fog experiments, as well as from the Neklid phenomenon.

The subparhelic circle is created by internal reflections in Parry-oriented column crystals, with several possibilities involving different numbers of total internal reflections in the crystal.