88.6% of lunar illumination
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Different traditions disagree about this day but overall, it is thought to be rather negative. It isn't advisable to undertake anything important, but if you have promised something to someone, make sure you keep your word. Medical treatment is not advisable on this day, especially if it involves surgery.
This is the month when the winter cold fastens its grip and the nights become long and dark. This full Moon is also called the Long Nights Moon by some Native American tribes.
During this month the winter cold fastens its grip, and nights are at their longest and darkest. It is also sometimes called the Moon before Yule. The term Long Night Moon is a doubly appropriate name because the midwinter night is indeed long, and because the Moon is above the horizon for a long time. The midwinter full Moon has a high trajectory across the sky because it is opposite a low Sun.