Posted on 02/19/2008 9:05:15 AM PST by Zuben Elgenubi
Find out more about this eclipse, including observing projects you can do with a telescope or your unaided eye, in Sky & Telescope's February issue. |
In the Americas, the eclipse happens during convenient evening hours on Wednesday, the 20th, when people are up and about. In the time zones of Europe and West Africa, the eclipse happens during the early-morning hours of Thursday, the 21st.
Earths shadow will totally engulf the Moon from 10:00 to 10:52 p.m. Eastern Standard Time, or 7:00 to 7:52 p.m. Pacific Standard Time, as shown at lower right. The partial phases of the eclipse last for about an hour and a quarter before and after totality.
Unlike a solar eclipse, each stage of a lunar eclipse is visible to everyone on the Moon-facing side of Earth at once; were all looking together.
Stages of the Eclipse
A total lunar eclipse goes through five distinct stages.
The eclipse technically begins when the Moons edge first enters the penumbra, or pale outer fringe, of Earths shadow. But the shading in the outer part of the penumbra is extremely slight. Not until the Moons leading edge is about halfway across the penumbra does the first slight dimming become detectable to the eye. This penumbral stage of the eclipse becomes much more evident as the minutes advance and the Moon moves deeper in.
Early in the partial eclipse comes a special moment of recognition: when you first see that Earths shadow has a curved edge and realize, just like astute observers in ancient times, what this means: the planet we live on is round. (See picture below).
Total eclipse begins when the last bit of the Moon slips into the umbra. For this eclipse, totality will last 52 minutes. On rare occasions it can persist for as long as 106 minutes.
Then, as the Moon continues moving eastward along its orbit, events unwind in reverse order. The Moons leading edge re-emerges into sunlight, ending totality and beginning stage four: when the eclipse is once again partial.
After all of the Moon escapes the umbra, only the last, penumbral shading is left for stage five. This final duskiness gradually fades away for the next 40 minutes or so, finally leaving the full Moon shining as bright and white as if nothing had happened.
The umbra is the part of Earths shadow where the Sun is blocked completely. So why does the eclipsed Moon glow deep orange or red, rather than being blacked out?
The answer is amazing.
The red light you'll see on the Moon comes from all the sunrises and sunsets that are occurring around Earth at the time. Our atmosphere scatters and refracts (bends) the sunlight that grazes the rim of our globe, sending some of it into Earths shadow.
If you were an astronaut standing on the Moon, the situation would be obvious. You would see the Sun covered up by a dark Earth that was ringed all around with a thin, brilliant band of sunset- and sunrise-colored light.
Watch the Moon carefully for other colors during totality, especially through binoculars or a telescope. Sometimes delicate blues, greens, and purples come and go. Time-lapse photography may show flying shadows crossing the Moons face during totality. These result from different features along Earths sunrise-sunset ring fading and brightening as the Sun shifts position behind Earth.
For this eclipse the Moon will be in the midst of some fine celestial scenery, like a big cameo stone with shiny little gems on the sides. The Moon will be more or less between bright Saturn and the slightly dimmer star Regulus. (Their exact arrangement will depend on where you're looking from.) The whole scene will just fit in the field of view of most binoculars.
The Next Eclipses
After three total lunar eclipses in less than a year, we face a dry spell. Partial ones occur for Europe, Africa, and parts of Asia on August 16, 2008, and December 31, 2009. The Americas get a partial one on the morning of June 26, 2010. But not until the night of December 2021, 2010, does the next total lunar eclipse happen. That night the Americas will once again be favored.
Earth's shadow will totally engulf the Moon from 10:00 to 10:52 p.m. Eastern Standard Time, or 7:00 to 7:52 p.m. Pacific Standard Time, as shown at lower right. The partial phases of the eclipse last for about an hour and a quarter before and after totality.Even though its eclipse is partial, it still gets to have totality. The Moon has it too danged easy. ;')
Here’s hoping you see a good moon arising... :-)
My son got a telescope for Christmas. It’ll be fun to check this out with it. He’ll be so excited!
Why, thank you! I haven’t mooned anyone for quite some time...been more than a week, IIRC...
;op
Telescopes are not of much use with total eclipses—too much power. A telephoto lens of about 600 mm focal length would allow some good photos.
Bump
Hehehehe!
My 8-year old kid has been driving me NUTS about wanting to stay up and watch this. I don’t have any problem letting him stay up, but given that it’s February and we live in Michigan, it’ll probably be cloudy and snowing.
Have him/her visit the Sky & Telescope magazine webpage (link above and in masthead). That way if it's cloudy, you'll know where the moon should be. Full moon lunar eclipses are always in the Eastern sky. Heck, maybe you;ll see a reduction of the moonshine through the clouds. That could hold em over till 10 yrs old.
Now if the weather will co-operate :-\
bump
Remember....
Nice viewing tonight. Perfect conditions in SW Ohio. Don’t forget to look in the constellation Perseus for the naked eye comet. It’s easy to spot if you know where to look. Binoculars really help, tho.
((((((( ping ))))))
Thanks. I watched it for a while, then got cold and went inside. :’)
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