The 73rd parallel north is a circle of latitude that is 73 degrees north of the Earth's equatorial plane, in the Arctic. It crosses the Atlantic Ocean, Europe, Asia, the Arctic Ocean and North America.
At this latitude the sun is visible for 24 hours, 0 minutes during the summer solstice and nautical twilight during the winter solstice.
73rd parallel north Wikipedia
Starting at the Prime Meridian and heading eastwards, the parallel 73° north passes through:
Between 1776 and 1950, the 73rd parallel formed the northern limit of the Royal Greenland Trade Department's exclusive monopoly on trade near the Dano-Norwegian and later Danish colonies of Greenland (1776–1782) and North Greenland (1782–1950).