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The entire wiki reimagined as a visual magazine with video discovery · Watch your interests come alive
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Tangent arc
Videos
Tangent arcs are a type of halo, an atmospheric optical phenomenon, which appears above and below the observed Sun or Moon, tangent to the 22° halo. To produce these arcs, rod-shaped hexagonal ice cry
An upper tangent arc appearing above San Francisco Bay and Marin County in California, at sunset on April 9, 2023.
An upper tangent arc appearing above San Francisco Bay and Marin County in California, at sunset on April 9, 2023.
An upper tangent arc with the Sun at an observed low altitude.
An upper tangent arc with the Sun at an observed low altitude.
A halo display observed over the South Pole. Featured in the photo are several distinct phenomena: A parhelic circle (horizontal line), a 22° halo (ci
A halo display observed over the South Pole. Featured in the photo are several distinct phenomena: A parhelic circle (horizontal line), a 22° halo (circle) with a sundog (bright spot), and an upper tangent arc. Photo: Cindy McFee, NOAA, December 1980.
A 22° halo featuring two sun dogs on both sides, as well as an upper and a lower tangent arcs at the top and the bottom.
A 22° halo featuring two sun dogs on both sides, as well as an upper and a lower tangent arcs at the top and the bottom.
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 occlu
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.
A halo display observed over the South Pole. Featured in the photo are several distinct phenomena: A parhelic circle (horizontal line), a 22° halo (ci
A halo display observed over the South Pole. Featured in the photo are several distinct phenomena: A parhelic circle (horizontal line), a 22° halo (circle) with two sundogs (bright spots), a Parry arc, and an upper tangent arc. Photo: Cindy McFee, NOAA, December 1980.
22° sun halo with a complete parhelic circle. Photo is taken with Samsung S10 phone (wide lens) near Zazid, Slovenia, on May 19th, 2023.
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 Piszké
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.