For sky watchers, the end of 2016 is bringing some excellent lunar viewing opportunities. From Oct. 16 through the end of the year there are three supermoon sightings and the one coming up on Nov. 14 might be the best of the year.
Because of the moon's elliptical orbit, one side of the orbit — the perigee — is about 30,000 miles closer to the Earth than the other side of the orbit, called the apogee. When the sun, Earth, and moon line up, it's called syzygy (toss that in your back pocket for a guaranteed Jeopardy! win someday). As NASA explains, "When perigee-syzygy of the Earth-moon-sun system occurs and the moon is on the opposite side of the Earth from the sun, we get a perigee moon or more commonly, a supermoon!"