“The sunlight reaching and reflecting off the Moon this time of year is about 7 percent more intense” than in the summer, explains NASA.
The moon officially turns full at 10:47 a.m. Sunday, but it will look full or very close to full to the naked eye Friday, Saturday and Sunday nights.
December’s full moon is known as the Cold Moon or Frost Moon because of the cold weather at this time of year. It is also sometimes referred to as the Moon Before Yule (Yule is an old northern European winter festival, associated with Christmas).
While this supermoon is 2017’s one and only, 2018 will start with two in succession. Supermoons are set to occur twice in January, on the 2nd and 31st. When two full moons occur in the same month, the second is sometimes called a blue moon or, in this case, a super blue moon.
Astrologer Richard Nolle defined a supermoon in 1979, but the term has really taken off in the past few years. Nolle said that a supermoon is a new or full moon that occurs when the moon is within 90 percent of its closest approach to Earth, known as perigee, in a given orbit.
In Washington, D.C., moon rise in the eastern sky will occur at 3:42 p.m., 4:26 p.m., and 5:15 p.m. Friday, Saturday and Sunday nights, while moon set occurs at 5:35 a.m., 6:47 a.m., and 7:58 a.m. Saturday, Sunday and Monday mornings.
The cloud cover forecast Friday, Saturday and Sunday nights, shown below, offers a good general sense for the areas that can expect clear skies. The good news for much of the Eastern Seaboard is that clear to partly cloudy skies should prevail during this period, except for Saturday night in the Northeast. More extensive cloud cover is forecast in the Pacific Northwest and Great Lakes regions throughout the period.