THE VIKING LUNAR CALENDAR
Skol
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Mörsugur
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" The third winter month is associated with the word fat, probably animal fat. Some call it Bone Marrow Sucking month. This is the month winter solstice is held, and it mostly falls on December 21st ."
Source: http://norse-mythology.net/the-viking-lunar-calendar-the-names-of-months-and-days/