There's A Lunar Eclipse This Morning
STAR GAZER
THE INTERNATIONAL EDITION
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STAR GAZER
Episode # 07-34 / 1550th Show
To Be Aired : Monday 8/20/2007 through Sunday 8/26/2007
"Don't Miss Next Week's Eclipse Of
The Sturgeon Moon : The Last Of The Dual
Eclipses Of 2007"
Horkheimer: Greetings, greetings fellow star gazers. Next Tuesday morning, August 28th, we will be treated to the last of the dual eclipses of 2007, the first of which occurred on Saturday March 3rd. We're calling it the eclipse of the Sturgeon Moon which is the name many American Indian fishing tribes gave the August full Moon since sturgeon were easily caught during August. But what causes an eclipse of the Moon anyway? Let me show you.
O.K., let's imagine that we're out in space looking down on our Moon, Earth and Sun. Now Moonlight is really light from the Sun reflected off the Moon and back to our Earth. So one half of the Moon is lit up by the Sun at all times, although the only time we see the half of the Moon that is completely lit up is when we have a full Moon which occurs every month whenever the Moon is directly opposite the Sun as seen from Earth. Now usually when we have a full Moon the Moon is either above or below the plane of our Earth's orbit. But occasionally the full Moon will glide directly into our Earth's plane and will pass directly through our Earth's shadow which will block most of the Sun's light from reaching it. In other words our Earth's shadow will eclipse the light of the Sun which is why we call such an event an eclipse.
But during a total lunar eclipse the Moon never completely disappears but always turns some unpredictable shade of reddish orange and that's because the red rays of sunlight are always bent by our Earth's atmosphere into our Earth's shadow, filling it with a faint reddish orange light. So during a total lunar eclipse the reddish orange Moon color you see is actually light from all the sunrises and sunsets around the world being refracted, that is bent, into our Earth's shadow and onto the Moon and then reflected back again. And that's what you'll see Tuesday morning between midnight and dawn.
Now if we could look at our Earth's shadow cone more closely we would see that there are two distinct parts to it. A pale outer shadow called the penumbra and a smaller dark shadow called the umbra. The penumbral phase of the eclipse is never very noticeable so I'm suggesting that you start watching when the Moon begins to enter the umbra which is 4:51 a.m. Eastern Daylight Time or your local equivalent. Then as minute after minute goes by you will actually see the umbra which is our Earth's curved shadow slowly creep across the Moon and gradually darken it and cause it to change color. The Moon will be completely within the umbra and totally eclipsed for about 91 minutes from 5:52 a.m. to 6:23 a.m. Eastern Time, after which the whole process will slowly reverse. But people on the east coast will see only the first half of the eclipse, the entire show is reserved for the west coast. Because no one can predict what color the Moon will turn during totality that's what makes it so much fun. Will it be bright orange, or blood red? Only the shadow knows. See for yourself. And go to our website for more info. Keep looking up!
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Star Gazer Minute
#07-34 M
8/20/2007 thru 8/26/2007
"Don't Miss Next Week's Eclipse Of
The Sturgeon Moon : The Last Of The Dual
Eclipses Of 2007"
Horkheimer: Don't miss next Tuesday's total eclipse of the Moon. A total lunar eclipse occurs whenever a full Moon glides directly into our Earth's shadow which blocks most of the Sun's light from reaching it because moonlight is nothing more than reflected sunlight. There is however always some red sunlight which is bent by our Earth's atmosphere into the shadow. So during totality the Moon always turns some unpredictable shade of reddish orange. At 4:51 a.m. Eastern Time or your local equivalent you can watch our Earth's curved shadow start to glide across the Moon. Totality begins at 5:52 a.m. Go to our website for more info and keep looking up!
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Please give us your comments. (Click Here)
For GRAPHICS for this script (Click) Here
"Jack Horkheimer : Star Gazer" is underwritten by a grant from