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"There will be an amazing spectacle tonight as the first supermoon in almost 70 years appears in the night sky. In fact, if you’re younger than 68 you have never witnessed this record-breaking supermoon in your lifetime.  A supermoon typically refers to the concurrence of two phenomena. One is when the moon is within 90% of its closest position to Earth in its orbit. Since the moon’s orbit is elliptical the moon during perigee is about 30,000 miles closer to the Earth than the apogee. The other phenomenon is syzygy, which is when the Earth, sun and moon all line up as the moon orbits Earth. When both a perigee and syzygy occur and the moon is located on the opposite side of the Earth from the sun we get a supermoon." Read more at  forbes.com

 A full moon coinciding with Christmas does not happen often — usually, once every 19 years. But this time, it is different, because a full moon on Christmas hasn't happened in nearly four decades. The last one was in 1977, and that's because of the vagaries of our calendar and a lunar cycle known for almost 2,500 years ( Space.com )