One of the phenomena that most surprises people is a solar eclipse. However, many people don't know what a lunar eclipse is . A lunar eclipse is an astronomical phenomenon. When the Earth passes directly between the Moon and the Sun, the Earth's shadow, cast by sunlight, is projected onto the Moon. For this to happen, the three celestial bodies must be in syzygy, or close to it. This means they are aligned in a straight line. The type and duration of a lunar eclipse depend on the Moon's position relative to its orbital node, which is the point where the Moon's orbit intersects the plane of the Sun's orbit. If you'd like to learn more about this phenomenon, you can consult our guide on syzygy.
In this article, we'll tell you what a lunar eclipse is, its characteristics, and its origin.
What is a lunar eclipse
To understand the types of lunar eclipses, we must first understand the shadows cast by the Earth on the Sun. The larger our star is, the more it produces two types of shadows: the umbra, a darker cone-shaped area where all light is blocked, and the penumbra, the area where only some light is blocked. There are between two and five lunar eclipses each year. If you're interested in learning more about eclipses in general, you can read about the different types of eclipses.
The same three celestial bodies intervene in a solar eclipse, but the difference between them lies in the position of each celestial body. In a lunar eclipse, the earth is located between the moon and the sun, casting a shadow on the moon, while in a solar eclipse, the moon is located between the sun and the earth, casting its shadow on a small part of the latter. .
Another difference from a solar eclipse is that a total lunar eclipse lasts an average of 30 minutes to an hour, but can extend for several hours. This is simply a result of the larger Earth relative to the smaller Moon. In contrast, the Sun is much larger than both the Earth and the Moon, making this phenomenon very short-lived.
Origin of the lunar eclipse
There are between 2 and 7 lunar eclipses each year. Depending on the moon's position relative to the Earth's shadow, there are 3 types of lunar eclipses. Although they are more frequent than solar eclipses, they don't occur every time there is a full moon due to the following conditions:
The moon must be a full moon, that is, a full moon. In other words, relative to the sun, it is completely behind the earth. The earth must be physically located between the sun and the moon so that all celestial bodies are in the same orbital plane at the same time, or very close to it. This is the main reason why they do not occur every month, because the moon's orbit is tilted about 5 degrees from the ecliptic. The moon must totally or partially pass through the earth's shadow.
Types of lunar eclipse
Total lunar eclipse
This happens when the moon as a whole passes through the shadow of the earth's threshold. In other words, the moon completely enters the cone of the umbra. In the development and process of this type of solar eclipse, the moon goes through the following sequence of eclipses: penumbra, partial eclipse, total eclipse, partial and penumbra.
Partial lunar eclipse
In this case, only part of the moon enters the Earth's shadow, while the other part remains in the penumbra. It's interesting to know how this phenomenon relates to solar eclipses, which can be seen in the next event, scheduled for March 2024.
Twilight lunar eclipse
The moon only passes through the twilight zone. This type of eclipse is the most difficult to observe because the shadows on the moon are very subtle, and precisely because the penumbra is a diffuse shadow. Furthermore, if the moon is entirely within the penumbra, it is considered a total penumbral eclipse; if part of the moon is in the penumbra and the other part is not in shadow, it is considered a partial penumbral eclipse.
Steps
In a total lunar eclipse, a series of phases can be distinguished by the moon's contact with each shaded area.
- The twilight lunar eclipse begins. The moon is in contact with the outside of the penumbra, which means that from now on, one part is within the penumbra and the other part is outside.
- The beginning of a partial solar eclipse. By definition, a partial lunar eclipse means that one part of the moon is located in the threshold zone and the other part is located in the twilight zone, so when it touches the threshold zone, the partial eclipse begins.
- The total solar eclipse begins. The moon is completely within the threshold area.
- Maximum value. This phase occurs when the moon is in the center of the umbra.
- The total solar eclipse has ended. After reconnecting with the other side of the gloom, the total solar eclipse ends, the partial solar eclipse begins again, and the total eclipse ends.
- The partial solar eclipse has ended. The moon completely leaves the threshold zone and is completely in twilight, signifying the end of the partial eclipse and the beginning of twilight again.
- The twilight lunar eclipse ends. The moon is completely out of twilight, signifying the end of the twilight lunar eclipse and the lunar eclipse.
Some history
In early 1504, Christopher Columbus sailed for the second time. He and his crew were in the north of Jamaica, and the locals began to doubt them, they refused to continue sharing food with them, causing serious problems for Columbus and his people.
Columbus read in a scientific document at the time, which included the lunar cycle, that a solar eclipse would soon occur in the area, and he seized this opportunity. On the night of February 29, 1504, wanting to demonstrate his superiority, he threatened to let the moon disappear . When the locals saw him do so, they begged him to restore it to its original state. Apparently, he did so a few hours after the eclipse ended.
In this way, Columbus managed to get the locals to share their food.
I hope that with this information you can learn more about what a lunar eclipse is and its characteristics.