Parry arc
Videos
A Parry arc is a rare halo, an optical phenomenon which occasionally appears over a 22° halo together with an upper tangent arc.
A halo display photo documented by Cindy McFee, NOAA, December 1980 at the South Pole Station. Several distinct halo phenomena are featured in the photo: Two sun dogs (bright spots), a parhelic circle (horizontal line), a 22° halo (circle), and an upper tangent arc and a Parry arc (top).
Complex Moon halo. Visible are: halo, Parry arc, upper tangent arc and Moon dogs.
Detail of a Parry arc along with an upper tangent arc, both visible between a 22° halo and a 46° halo.
Parhelic circle
Videos
A parhelic circle is a type of halo, an optical phenomenon appearing as a horizontal white line on the same altitude as the Sun, or occasionally the Moon. If complete, it stretches all around the sky,
A crisp parhelic circle (horizontal line) over South Pole Station. Note that this image does not depict a solar eclipse and the sun was probably occluded by a device to protect the camera. Photo: John Bortniak, NOAA, January 1979.
22° sun halo with a complete parhelic circle. Photo is taken with Samsung S10 phone (wide lens) near Zazid, Slovenia, on May 19th, 2023.
A nearly complete paraselenic circle, along with a partial 22° lunar halo and the eastern moon dog. Photo is taken by the all-sky camera of the Piszkéstető Mountain Station, Konkoly Observatory (Hungary), February 2023.