Subparhelic circle

The subparhelic circle is a rare halo, an optical phenomenon, located below the horizon.

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.

[1][2] On the accompanying photo centred at the antisolar point, the subparhelic circle appears as a gently curved horizontal line intercepted by anthelic arcs.

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This photo centred at the antisolar point shows various antisolar halos, as seen on a flight from Brussels to Madrid on 7 August 2006.
Credit: Francesco De Comité