In this handout provided by NASA, an aircraft taking off from Ronald Reagan National Airport is seen passing in front of the moon as it rises on December 3, 2017 in Washington, DC. (Photo by NASA/Bill Ingalls via Getty Images)
In this handout provided by NASA, an aircraft taking off from Ronald Reagan National Airport is seen passing in front of the moon as it rises on December 3, 2017 in Washington, DC. (Photo by NASA/Bill Ingalls via Getty Images)

The name supermoon was coined by astrologer Richard Nolle in 1979, arbitrarily defined as... a new or full moon which occurs with the Moon at or near (within 90% of) its closest approach to Earth in a given orbit (perigee). In short, Earth, Moon and Sun are all in a line, with Moon in its nearest approach to Earth.

A supermoon rises in front of a replica of the Statue of Liberty sitting atop the Liberty Building in downtown Buffalo, N.Y., Sunday, Dec. 3, 2017. (AP Photo/Julio Cortez)
A supermoon rises in front of a replica of the Statue of Liberty sitting atop the Liberty Building in downtown Buffalo, N.Y., Sunday, Dec. 3, 2017. (AP Photo/Julio Cortez)

This December 3, supermoon appears full for about three days, since late Friday night through today early evening.

The Supermoon rises above Whitby Abbey in Whitby, north east England, Sunday Dec. 3, 2017. (Danny Lawson/PA via AP)
The Supermoon rises above Whitby Abbey in Whitby, north east England, Sunday Dec. 3, 2017. (Danny Lawson/PA via AP)

This full moon is the first of three consecutive supermoons. The two will occur on Jan. 1 and Jan. 31, 2018. The closest supermoon of the century will occur on December 6, 2052.

The moon rises over the CN Tower and skyline in Toronto, Ontario, Saturday, Dec. 2, 2017. THE CANADIAN PRESS/Mark Blinch/The Canadian Press via AP)
The moon rises over the CN Tower and skyline in Toronto, Ontario, Saturday, Dec. 2, 2017. THE CANADIAN PRESS/Mark Blinch/The Canadian Press via AP)