How does a lunar eclipse happen?
- The sun casts its rays on the earth to form a shadow large enough to cover the moon, but there are some indirect rays from the sun that reach the moon, where they are bent by the earth's atmosphere to form semi-shaded areas. that receive gloom. . The areas that are illuminated but not completely are called semi-shadow areas, and the completely dark areas that do not reach the solar radiation are called the shadow area.
- A lunar eclipse occurs when it lines up with the Sun and Earth. A total lunar eclipse begins when the moon is in twilight. It is the outer part of the partially shaded region of the Earth, where the moon becomes almost invisible, and when the moon moves into the shaded region where the sunlight does not reach, a partial eclipse begins, in which it appears a curved shadow creeping across the moon's surface.
- Although the Earth blocks the Sun's rays from the Moon at this time, some Sun's rays are reflected by the Earth's atmosphere and fall on the Moon's surface, causing them to appear in colors that depend on how clean the atmosphere is at the moment. time of broadcast. eclipse. If the weather is dusty, the moon appears dark red, gray, or reddish black. A partial lunar eclipse can usually be seen in the sky at sunrise or sunset.
- The phenomenon of eclipses occurs when the moon is at full moon most of the time, but the moon's orbit around the earth deviates 5.2 degrees from the earth's orbit around the sun, which explains why Lunar eclipses do not occur. Every time the full moon appears and a solar eclipse does not occur every time the moon appears in the form of a crescent at the beginning of the lunar month, so a lunar eclipse does not occur except when the moon is at the points of intersection of the moon It rotates with the Earth's orbit around the
types of lunar eclipse
The shape and type of a lunar eclipse depends on how much of Earth's shadow covers the moon's surface; It is divided into several types as follows:
Total Eclipse: This type of eclipse occurs when the Moon moves completely into the Earth's shadow, and occurs about 35% of the time eclipses occur.
Partial Eclipse: This type of eclipse occurs when part of the Moon enters the Earth's shadow. As this part darkens, the rest of the moon remains bright.
Semi-shadow eclipse: This type of eclipse occurs when the moon passes through the semi-shadow region of the Earth, and the part of the moon that is darkened is dark, while the rest is bright. It can appear gray or gold, and it can disappear entirely, and the amount of lunar darkness in this type of eclipse is directly proportional to the area of sunlight blocked by Earth. It is not easily seen.
The longest total lunar eclipse of the twenty-first century
- The longest total lunar eclipse of the 21st century occurred on July 27, 2018 and lasted 1 hour and 43 minutes, the duration of the eclipse was unusually long; Because the Moon was near the farthest point from Earth and was rotating slowly, which made it appear smaller and take longer to move through Earth's shadow, and the Earth was at its furthest point from the Sun , which made Earth's shadow appear larger than usual.
- A lunar eclipse occurs when it is on the same line with the sun and Earth, and when the moon is in full moon phase most of the time. There are three types of lunar eclipses. Total eclipse, partial eclipse, semi-shadow eclipse, the longest total lunar eclipse of the 21st century occurred on July 27, 2018, lasted 1 hour and 43 minutes, and the duration of the eclipse was unusually long.
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