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A Liljequist parhelion is a rare halo, an optical phenomenon appearing on the parhelic circle approximately 150–160° from the sun between a 120° parhelion and the anthelion (opposite to the sun at the antisolar point).
A lower tangent arc is a rarely observable halo, an optical phenomenon appearing under and tangent to a 22° halo centred around the sun.
Carl Pulfrich (September 24, 1858, Burscheid, Rhine Province – August 12, 1927) was a German physicist, noted for advancements in optics made as a researcher for the Carl Zeiss company in Jena around 1880, and for documenting the Pulfrich effect, a psycho-optical phenomenon that can be used to create a type of 3-D visual effect.
Liljequist parhelion, a rare halo, an optical phenomenon appearing on the parhelic circle approximately ±150-160° from the sun