Archive for month: November, 2016

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The Supermoon occurs on Monday, November 14, peaking around 9 PM our time (8:52 EST). It will appear on our horizon just before 5 PM on Monday. Do not expect it to look dramatically different than any other full Moon. It will look big and bright like any full Moon near to the horizon. Monday’s Supermoon will be 14% larger and may appear 30% brighter. Yet you may not know it had you not been told to look for the “Supermoon.” Astronomers traditionally call this kind of moon a Perigee Moon. Term “Supermoon” comes to us from “astrology.” Since it was coined in astrology it has made its way into popular culture. Supermoon seems to be catchier than Perigee Moon. It occurs because the path of the Moon around the Earth is not a perfect circle but instead somewhat egg-shaped (elliptical). We say the Moon is 240,000 miles away but it varies. The actual distance varies over the course of the orbit of the Moon, from 356,500 km (221,500 mi) at the perigee to 406,700 km (252,700 mi) at apogee, resulting in a differential range of 50,200 km (31,200 mi). Interestingly the Moon is spiraling away from the earth at a rate of about 1.5 inches per year as detected by the Lunar Laser Ranging Experiment which utilizes LASERS and mirrors left on the Moon by the Apollo missions. The Moon is said to be at perigee when it is at its nearest and at apogee when it is at its farthest. This particular “perigee” occurring on Monday is the closest perigee since Read more →