Gabatarwa: Dec 22 ita ce lokacin hunturu, rana mafi guntu na shekara a Arewacin Hemisphere. A wannan rana, rana ta kai mafi ƙasƙanta a sararin sama, wanda ke haifar da mafi ƙarancin kwanaki da mafi tsayi. Tsawon shekaru aru-aru, lokacin sanyi ya yi zafi...
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