Print of steel engraving titled „Aurore Boriale“.

Drawn by Danvin.

Engraved by unknown.

From „l‘Univers. Histoire et Description de tous les peuples. Amerique Meridionale, iles diverses de l‘Ocean et regions circompolaires. Chili, Paraguay, Uruguay, Buenos-Ayres, Patoganie, Terre-du-Feu et Archipel des Malouines, iles diverses“ by M. Cesar Famin, M. Frederic Lacroix. Published by Firmin Didot Freres, Editeurs. Paris. 1856.

A polar circle is either the Arctic Circle or the Antarctic Circle. On Earth, the Arctic Circle is located at a latitude of 66°33′46.2″ N, and the Antarctic Circle is located at a latitude of 66°33′46.2″ S. Areas between each polar circle and its associated pole (North Pole or South Pole), known geographically as the frigid zones, would theoretically experience at least one 24-hour period when the sun is continuously above the horizon and at least one 24-hour period when the sun is continuously below the horizon annually. However, due to atmospheric refraction and the Sun being an extended object rather than a point source, the continuous daylight area is somewhat extended while the continuous darkness area is somewhat reduced.

Approx. image size 11, 9 x 8, 1/22 x 14 cm. Condition: good.