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From: Roger Nelson
To: All
Date: 2017-12-03 06:33:36
Subject: A Supermoon Trilogy

A Supermoon Trilogy
 
Mark your calendars: a series of three supermoons will appear on the
celestial stage on December 3, 2017, January 1, 2018, and January 31, 2018.
 
https://www.youtube.com/watch?time_continue=4&v=tARtQkWdZSM
 
A supermoon is a Moon that is full when it is also at or near its closest
point in its orbit around Earth. Since the Moon's orbit is elliptical, one
side (apogee) is about 30,000 miles (50,000 km) farther from Earth than the
other (perigee).  Nearby perigee full Moons appear about 14% bigger and 30%
brighter than full Moons that occur near apogee in the Moon's orbit.
 
"The supermoons are a great opportunity for people to start looking at
the Moon, not just that once but every chance they have!" says Noah
Petro, a research scientist from NASA's Goddard Space Flight Center.
 
It's hard for our eyes to distinguish these small changes in size when the
Moon is high amidst the vastness of the night sky. But any time you catch a
full Moon as it rises or sets, while it's suspended low on the horizon
beaming through the silhouettes of trees or buildings, its apparent size
might make you do a double-take. You almost feel as though you could reach
out, grab the glowing orb, and drop it into your coffee cup. Even more so
if it's a supermoon.
 
If you can only catch one episode of the supermoon trilogy, catch the third
one. It will be extra special.
 
First of all, the January 31st supermoon will feature a total lunar
eclipse, with totality viewable from western North America across the
pacific to Eastern Asia. The Moon's orbit around our planet is tilted so it
usually falls above or below the shadow of the Earth. About twice each
year, a full Moon lines up perfectly with the Earth and Sun such that
Earth's shadow totally blocks the Sun's light, which would normally reflect
off the Moon.
 
"The lunar eclipse on January 31 will be visible during moonset. Folks
in the Eastern United States, where the eclipse will be partial, will have
to get up in the morning to see it," notes Petro. "But it's
another great chance to watch the Moon."
 
The Moon will lose its brightness and take on an eerie, fainter-than-normal
glow from the scant sunlight that makes its way through Earth's atmosphere.
Often cast in a reddish hue because of the way the atmosphere bends the
light, totally eclipsed Moons are sometimes called `blood Moons.'
 
"We're seeing all of the Earth's sunrises and sunsets at that moment
reflected from the surface of the Moon," says Sarah Noble, a Program
Scientist at NASA headquarters.
 
The January 31st supermoon will also be the second full Moon of the month.
Some people call the second full Moon in a month a Blue Moon, that makes it
a super `blue Moon.' Blue Moons happen every two and a half years, on
average. With the total eclipse, it'll be a royal spectacle indeed: a
`super blue blood' Moon.
 
Sometimes the celestial rhythms sync up just right to wow us. Heed your
calendar reminders. On the three dates marked, step out into the moonset or
moonrise and look up for a trilogy of sky watching treats!
 
To learn more about the many wonders of the Moon, go to moon.nasa.gov.
 
For more on the many skywatching events to be found throughout the year,
visit science.nasa.gov
 
 
Regards,
 
Roger

--- DB 3.99 + PQUSA
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