This year there will be a full moon on the winter solstice, December 22. Since this full moon will occur in conjunction with a lunar perigee (the point in the moon's elliptical orbit that is closest to Earth), the moon will appear about 14% larger than it does at apogee (the point in its orbit that is farthest from the Earth). Also, this will be the closest perigee of the moon this year (the moon's orbit is constantly deforming). Since the Earth is also several million miles closer to the sun at this time of the year than in the summer, sunlight striking the moon is about 7% stronger, making the moonlight brighter. If the weather is clear and there is a snow cover where you live, it is believed that even car headlights will be superfluous. On December 21st, 1866 the Lakota Sioux took advantage of this combination of occurrences and staged a devastating retaliatory ambush on soldiers in the Wyoming Territory. In laymen's terms, it will be a super bright full moon, AND it hasn't happened this way for 133 years! Our ancestors 133 years ago saw this. Our descendants 100 or so years from now will see this again.