The city of tromso,Norway ,line 215 miles inside the arctic Circle. Throunfh the course of a year, tromso has alternating periods of mindnight sun and prologed darkness. The sun rises on may 21 and stays out unit july 25.on November 25,the sun drops behind the hills and does not brighten thecity again unit januray 21. feeble hours of grayness at midday Norwegians call this sunless period morketiden-"the murky time"