Supermoon Tonight# LeisureTime - 读书听歌看电影
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http://earthsky.org/tonight/is-biggest-and-closest-full-moon-on
What is a supermoon? The word supermoon didn’t come from astronomy. Instead
, it came from astrology. Astrologer Richard Nolle of the website astropro.
com takes credit for coining the term supermoon. In 1979, he defined it 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.
By this definition, according to Nolle:
There are 4-6 supermoons a year on average.
That doesn’t sound very special, does it? In fact, the June 2013 full moon
lines up much more closely with perigee – the moon’s closest point to
Earth – than Nolle’s original definition. According to Guy Ottewell’s
Astronomical Calendar 2013, the 2013 June full moon falls only 22 minutes
after the moon reaches perigee, the moon’s closest point to Earth for this
month and year. At perigee, the moon lies only 356,991 kilometers (221,824
miles) away. Two weeks later, on July 7, the moon will swing out to apogee
– its farthest point for the month and year – at 406,490 kilometers (252,
581 miles) distant.
What is a supermoon? The word supermoon didn’t come from astronomy. Instead
, it came from astrology. Astrologer Richard Nolle of the website astropro.
com takes credit for coining the term supermoon. In 1979, he defined it 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.
By this definition, according to Nolle:
There are 4-6 supermoons a year on average.
That doesn’t sound very special, does it? In fact, the June 2013 full moon
lines up much more closely with perigee – the moon’s closest point to
Earth – than Nolle’s original definition. According to Guy Ottewell’s
Astronomical Calendar 2013, the 2013 June full moon falls only 22 minutes
after the moon reaches perigee, the moon’s closest point to Earth for this
month and year. At perigee, the moon lies only 356,991 kilometers (221,824
miles) away. Two weeks later, on July 7, the moon will swing out to apogee
– its farthest point for the month and year – at 406,490 kilometers (252,
581 miles) distant.
