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For 103 minutes, the earth covers the moon on July 27th. Questions and answers at a glance.
by Christian Satorius
22. July 2018, 18:13
Updated 58 minutes ago
What's exactly going on with the longest total lunar eclipse of the 21st century?
On July 27, 2018, we wait for the longest lunar eclipse of the 21st century, at 103 minutes. The earth grows between the sun and the moon and the shadow. The shadow of the Earth then gradually causes the lunar darkening of the moon for a total lunar eclipse. Here is the time:
- to 20:24 [CET] Central European Summer Time (CEST), according to the US NASA Space Agency, the moon enters into the shadow of the earth.
- The total eclipse begins at 21:30 when it has completely entered the shadow of the Earth.
- It ends after 103 minutes at 23:13 when the moon of the Earth again leaves the shadow of the nucleus.
- According to NASA astronomers, this operation will be completed at 0:19 Central European Summer Time.
What we finally see from all the show depends of course on the weather. The sky should be as free of clouds as possible.
But one thing is already certain: anyone who forgets this lunar eclipse will no longer have the chance to observe such a total lunar eclipse during this century. However, if you can wait until June 9, 2123, you will be rewarded with a slightly longer eclipse.
Why is the moon sometimes white, sometimes red and sometimes blue?
When the moon is high in the starry sky, he usually sees white. The moon always appears white when it is directly illuminated by the sun and reflects all the spectral colors that make up the sunlight.
In a lunar eclipse, the moon of the Earth can also shine in orange or even red. These colors appear when the earth grows partly or completely in the direct path of the beam between the sun and the moon. The sunlight, which is falling above the earth on the moon, must first penetrate the atmosphere of the Earth at least partially – depending on the advance of the # 39; darkness. However, the more sunlight passes through the earth's atmosphere, the shorter its blue, violet and green shortwave fractions of the smaller particles or molecules in the atmosphere are scattered and thus virtually eliminated from the formerly white light. .
"The light that falls on the moon near the Earth's shadow has traveled the longest way," says Weihenstephan meteorologist Hans Häckel. In other words, when sunlight only briefly passes through the upper and lower layers of the atmosphere, there is more yellow and orange shortwave that can brighten the moon accordingly.
Under very special circumstances, the Earth's grave may even appear blue, for example after volcanic eruptions or even after forest fires. "In 1883, the Indonesian volcano Krakatau burst and threw so much dust in the air that the moon around the world seemed blue and the sun was green," says George F. Spagna, a physicist at Randolph-Macon College, Ashland, Virginia.
dpa
The result is a lunar eclipse.
Does the moon also shine during the day?
At night, the moon comes off visually, of course, particularly well from the dark night sky. But it can also be seen several times during the day, although daylight usually outperforms its brightness. It is particularly concise that the moon is as full as possible in sun-flooded daylight, but the moon can also be turned off and on.
If you explore the sky, you can try to find stars, because they can also be used during the day even if, because of their size or their distance from the earth, they are of course very eclipsed by sunlight and therefore difficult to see. The moon and the stars are better recognized in the morning and evening at dusk, assuming as clear a sky as possible, of course.
Why does not the moon shine like the stars of the sky?
"Stars twinkle because their light shines The Earth's atmosphere must be several kilometers thick," said John Graham, emeritus astronomer at the Carnegie Institute of Washington. "This atmosphere is full of air currents and turbulence that act like small lenses and prisms that push the light of the stars several times a second. "In other words, with so many tiny stars in the sky looks like a spark or a blink, but the Moon is far too big to be visually perceptible from the Earth's point of view, so the gaps are evened out here. not as beautifully as the stars. [1965] Where do the rings come from around the moon?
"Moon Court" is the name of the colorful crown of the rings of light sometimes glimpsed around the eastern moon. is caused by the 39 humidity of the atmosphere, inter alia by water droplets or ice crystals in the clouds. The deepest of these halos (halo) is usually bluish to whitish and is surrounded by a yellowish, which in turn surrounded by a reddish. This sequence can be repeated several times. "Wreaths are created by diffracting light from water drops or ice crystals in the clouds," Hans Häckel explains. "The deviation of light rays leads to superimpositions, interferences, which in turn produce colored rings."
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