How often do you get to witness an event that has not been seen since the year 1378,  over half a millennium, 632 years ago? Of course, weather will make or break the viewing, and it appears the much of the west coast of the USA will be socked in with a significant winter storm at that time.

Here’s the USA forecast for cloud cover. Blue is clearest, gray is cloud cover.
For those that can see it, the moon will likely appear as a deep coppery red, like this 2003 eclipse photo at left.

From Science @ NASA, they write: Everyone knows that “the moon on the breast of new-fallen snow gives the luster of mid-day to objects below.” That is, except during a lunar eclipse.
See for yourself on Dec. 21st, the first day of northern winter, when the full Moon passes almost dead-center through Earth’s shadow. For 72 minutes of eerie totality, an amber light will play across the snows of North America, throwing landscapes into an unusual state of ruddy shadow.

The eclipse begins on Tuesday morning, Dec. 21st, at 1:33 am EST (Monday, Dec. 20th, at 10:33 pm PST). At that time, Earth’s shadow will appear as a dark-red bite at the edge of the lunar disk. It takes about an hour for the “bite” to expand and swallow the entire Moon. Totality commences at 02:41 am EST (11:41 pm PST) and lasts for 72 minutes.
If you’re planning to dash out for only one quick look -­ it is December, after all -­ choose this moment: 03:17 am EST (17 minutes past midnight PST). That’s when the Moon will be in deepest shadow, displaying the most fantastic shades of coppery red.

Why red?
A quick trip to the Moon provides the answer: Imagine yourself standing on a dusty lunar plain looking up at the sky. Overhead hangs Earth, nightside down, completely hiding the sun behind it. The eclipse is underway. You might expect Earth seen in this way to be utterly dark, but it’s not. The rim of the planet is on fire! As you scan your eye around Earth’s circumference, you’re seeing every sunrise and every sunset in the world, all of them, all at once. This incredible light beams into the heart of Earth’s shadow, filling it with a coppery glow and transforming the Moon into a great red orb.

Back on Earth, the shadowed Moon paints newly fallen snow with unfamiliar colors–not much luster, but lots of beauty.
This lunar eclipse falls on the date of the northern winter solstice. How rare is that? Total lunar eclipses in northern winter are fairly common. There have been three of them in the past ten years alone. A lunar eclipse smack-dab on the date of the solstice, however, is unusual. Using NASA’s 5000 year catalog of lunar eclipses and JPL’s HORIZONS ephemeris to match eclipses and solstices, author Dr. Tony Phillips had to go back to the year 1378 to find a similar “winter solstice lunar eclipse.”

Author: Dr. Tony Phillips | Credit: Science@NASA

h/t to WUWT reader “Ray”

Read More By Anthony Watts at  wattsupwiththat.com