The subparhelic circle is a rare halo, an optical phenomenon located below the horizon. It passes through both the subsun, below the sun, and the antisolar point, opposite to the sun. The subparhelic circle is the subhorizon counterpart to the parhelic circle located above the horizon.
Located on the subparhelic circle are several relatively rare optical phenomena: The subsun, the subparhelia, the 120° subparhelia, Liljequist subparhelia, the diffuse arcs, and the Parry antisolar arcs.
- Les Cowley. "Subhorizon Arcs". Atmospheric Optics. Retrieved 2007-04-21. (including a computer simulation.)
- Les Cowley. "Antisolar Region Arcs". Atmospheric Optics. Retrieved 2007-04-21. (including a photo and a computer simulation.)
- Jarmo Moilanen. "Subhorizon diffuse arcs with Liljequist subparhelia". Halo Reports (Blogspot). Retrieved 2007-04-21.
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