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The midnight sun is above the horizon from 21 May to 24 July ( 65 days ) , and the period when the sun does not rise , polar night , is from approximately 30 November to 13 January ( 45 days ) .
 time: polar night
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 time: polar night