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   
    * Origin: NCS BBS - Houma, LoUiSiAna (1:3828/7)