Jeff Wilson / Sun Dog, or Parhelion, caused by refraction of the sun's rays, more commonly seen in Antarctica, above glacier, Dry Valleys, Antarctica, December 2009. Taken on location for the BBC series, Frozen Pla...

Bryan and Cherry Alexander / Polar bear (Ursus maritimus) mother and cubs with Parhelion / sun dogs over sea ice. Churchill, Manitoba, Canada.

Neil Lucas / Sundog / Parhelion (circle of light around the sun) with large ice fumerole in the foreground, McMurdo Sound, Ross Sea, Antarctica, November 2008

Jim Brandenburg / Sundogs, also known as mock sun, with snow field, Minnesota

Doug Allan / Parhelion sun effect over Brunt ice shelf, Antarctica

Ashley Cooper / Jet stream winds blowing clouds with parhelion, over the Annapurna Himalayas, Nepal. December 2012

Fabrice Cahez / Parhelion or sundog phenomenon, caused by refraction of sunlight through ice crystals in either clouds of freezing moist air. France, December 2016.

Richard Du Toit / Sundog or parhelion phenomena, Mountain Zebra National Park, South Africa.

Bryan and Cherry Alexander / A sun dog (parhelion / parhelia) in the sky above a truck on a stormy winter's day near Sabetta in the South Tambey Gas Field, Yamal Peninsula, Siberia, Russia. February 2014.

Mark Hamblin / 2020VISION / Sun dog or Parhelion, Cairngorms NP, Scotland, UK, December 2010

Frederique Olivier / Sundog / Parhelion (circle of light around the sun) seen from the back of icebreaker 'Aurora Australis' near Mawson Station, Antarctica, February 2011.

Jeff Wilson / 'Sun Dog', or Parhelion, caused by refraction of the sun's rays, more commonly seen in Antarctica, above glacier, Dry Valleys, Antarctica, December 2009. Taken on location for the BBC series, Frozen P...