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What Is A Lunar Eclipse?
A lunar eclipse is an astronomical phenomenon that occurs when the Earth passes directly between the Moon and the Sun. It causes the shadow of the Earth produced by the light of the Sun, to project on the Moon. It occurs, the three celestial bodies require to be in a position of “Sicilia” or close to it. It means that they form in a horizontal line.
Its type and duration of a lunar eclipse depend on the position of the Moon concerning its orbital nodes.
The points the orbit of the Moon crosses the plane of the realm of the Sun.
Shadow Of Lunar Eclipse
The types of a lunar eclipse, it is necessary to understand the shadow. The Earth produces as a result of the illumination of the Sun.
A star is more significant; it produces two types of shadow. One in the shape of a darker cone called Umbra and is the part where the light completely block. The Penumbra is the part where only a portion of the Sun is blocked. Every year between 2 and 5 lunar eclipses occur.
Difference Between Solar And Lunar Eclipses
- In solar eclipses, the same three celestial bodies intervene—the difference between the two lies in the position of each one of them.
- In a lunar eclipse, the Earth intervenes between Moon and Sun casting a shadow.
In a solar eclipse, the Moon interposes between the Sun and the Earth. A shadow on a small part of the latter. The satellite is visible from the horizon at night, during a solar eclipse.It’s only seen for brief moments and in certain parts of the Earth.
Another difference concerning solar eclipses is that a total lunar eclipse lasts on average from 30 minutes to 1 hour. It can extend for a few more hours. It is nothing more than a result of the large size of the Earth relative to the smaller Moon. In contrast, the Sun is much larger than the Earth and the Moon, which makes the phenomenon very brief.
A Lunar Eclipse Occur
Every year between 2 and 7 lunar eclipses occur. It according to the position of the Moon concerning the shadow of the Earth.
Three types of lunar eclipses occur, and they are more frequent than solar eclipses.
They do not occur every time there is a full moon, since the following is required:
- The Moon must be in full Moon, that is, in full Moon. That is, entirely behind the Earth concerning the Sun.
- The Earth must physically locate between the Sun and the Moon.
So all bodies are the same time in the same plane of the orbit, or very close to it.
It is the main reason why they do not occur every month since the Moon’s orbit is about 5 degrees from the ecliptic.
- The Moon must pass entirely or partially within the Earth’s shadow.
Types Of Lunar Eclipse
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Total Lunar Eclipse
It occurs when the Moon in its entirety (entire) passes through the Earth’s threshold shadow. In other words, the Moon fully enters the cone of the Umbra.
It is a series of stages that can distinguish. It determines by the contact of the Moon with each of the shadow areas.
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Partial Lunar Eclipse.
In this case, part of the Moon enters the threshold shadow of the Earth. Therefore the other region in the penumbra zone.
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Penumbra Lunar Eclipse.
The Moon only passes through the twilight area. It is the most challenging type to observe since the shadow on the Moon is quite subtle. It because the Penumbra is a diffuse shadow.
Additionally, the total penumbra eclipse considers if the Moon is entirely within the penumbra zone and partial penumbra eclipse. If only one part of the Moon is within the Penumbra and the other without any shadow.
Calculation Of The Size Of The Moon’s Shadow
The size of the shadow (S) can also express as a function of the lunar parallax (Pl), solar parallax (Ps), and the solar semi diameter (Ss). The size of the shadow indeed is:
S = Pl + Ps – Ss
The size of the Penumbra, upon the distance the Moon travels, is:
P = Pl + Ps + Ss + Pl / Sl
Colors Of The Eclipse
The Earth’s atmosphere has a vital influence on eclipses. If the atmosphere did not exist, in each total lunar eclipse, it would disappear completely (which we know does not happen).
The eclipsed Moon acquires a characteristic reddish color due to the scattering of light refracted by the Earth’s atmosphere. The Danjon scale uses to measure the degree of obs curation of lunar eclipses.
The light that passes through the upper part of the stratosphere penetrates the ozone layer. It absorbs the red light turning blue and refracts at the edge of the eclipse.
The bluish border measurement uses to calculate the size of the ozone layer.
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