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| Dates of the beginning and end of polar night and polar day at a given latitude This online calculator calculates the start and end dates of polar night and polar day at a given latitude. The latitude of the observation site must be north of the north polar circle or south of the south polar circle. |
| Dates of the beginning and end of polar night and polar day at a given latitude This online calculator calculates the start and end dates of polar night and polar day at a given latitude. The latitude of the observation site must be north of the north polar circle or south of the south polar circle. |