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Coming up: A total lunar eclipse

The Night Sky | Bob Berman

by Bob Berman
October 27, 2022
in Columns, Science
0
During a total lunar eclipse like the one next Monday night, the Moon ventures into Earth’s shadow, which is not black but distinctly reddish. But the color is only well seen during totality, which starts just after 5 a.m. (NASA)

Nature’s greatest sky spectacles may be perfectly silent, but they provoke shouts and gasps. People cannot believe the soul-stirring glory of a total solar eclipse or the brief shadow-casting seconds of a meteor’s exploding fireball. A bright auroral display, in contrast, is simply jaw-dropping. And yet a lunar eclipse causes no comparable human reaction. So an honest description of the coming total lunar eclipse next Monday night, November 7, might be “odd” rather than “glorious.” 

Nonetheless, the mere fact that our planet›s normally-invisible shadow is swallowing the moon, vivid proof that we really live on a sphere whose shadow is therefore always round, and that this shadow has an odd ruddy color thanks to all of the world’s sunrises and sunsets throwing their light into it, raises the ante and makes it a worthy sight.

Worthy but, in this case, inconvenient. The first inky bite of our planet’s shadow strikes the Moon at 4:09 E.S.T. meaning just after 4 a.m., so it’s technically happening  the opening hours of Tuesday the 8th. During the next hour or so, the moon’s 2,200 mph motion through space pushes it further into the shadow, creating strange, alien shapes. The very weirdest profiles unfold the quarter hour before totality, starting around  5 a.m.  If you want to set the alarm for one single time, it should be then.

At 5:15 a.m. the eclipse becomes total, and this lasts for nearly an hour, past even the time of moonset. Since the Moon gets lower and lower as the eclipse goes along, any hills, houses, or trees will soon block it altogether, especially its total portion. 

Bringing up the big question: Is this worth setting the alarm and looking out a west-facing window? I sure will, but if we’re to avoid over-hyping it, here’s a comparative score of other celestial events against which to compare it. If we award a score of 100 to a total solar eclipse — the total part of it, not the partial phases — then a bright display of the Northern Lights might earn an 80, and a so-called “Great Comet” that we see every 20 or 25 years would also earn an 80. A rich meteor shower could get a 40, and a lunar eclipse like this one might merit a 35. 

These subjective evaluations are offered  in case you want to compare the importance of this post-midnight eclipse versus the value of an uninterrupted sleep!

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Bob Berman

Bob Berman, Ulster Publishing’s Night Sky columnist since 1974, is the world’s most widely read astronomer. Since the mid-1990s, his celebrated "Strange Universe" feature has appeared monthly in Astronomy magazine, the largest circulation periodical on the subject. Berman is also the long-time astronomy editor of the Old Farmer’s Almanac. He was Discover magazine’s monthly columnist from 1989-2006. He has authored more than a thousand published mass-market articles and been a guest on such TV shows as Today and Late Night with David Letterman. Berman is director of two Ulster County observatories and the Storm King Observatory at Cornwall. He was adjunct professor of astronomy and physics at Marymount college from 1995-2000.

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