Lunar eclipse

The Moon moves into a shadow.

This shadow comes from the Earth. It happens when the Moon orbits through it.

The Moon can look orange or red.

This happens because sunlight passes through our air. The air changes the light.

This is like a sunset in the sky. You can see it from anywhere at night. It is safe to look at the Moon.

It is a beautiful sight to see.

A lunar eclipse happens when the Moon moves into Earth's shadow.

This event occurs when the Moon orbits through the shadow cast by our planet. There are two main parts to this shadow. The outer part is called the penumbra. In this area, the Sun is only partly blocked. The inner part is the umbra. This is the dark center where Earth blocks direct sunlight.

A total lunar eclipse happens when the Moon moves entirely into the umbra. During this time, the Moon often looks orange or red. This is sometimes called a blood moon. This color happens because sunlight passes through Earth's atmosphere. The air scatters blue light away. This leaves only the longer red light to reach the Moon. This is the same way sunsets look red.

Lunar eclipses are safe to watch with your eyes. You can see them from anywhere on the night side of Earth. They can last for an hour or even much longer.

A lunar eclipse is a special event in the sky. It happens when the Moon moves into the shadow of the Earth.

This can only happen when the Moon's path lines up with the Earth and the Sun. These times are called eclipse seasons. Unlike solar eclipses, which are hard to see, lunar eclipses are easy to watch. You can see them from anywhere on the night side of our planet. They are also safe to look at without any special eye protection.

There are different ways an eclipse can look. A penumbral eclipse happens when the Moon only touches the outer shadow, called the penumbra. This shadow only partially blocks the Sun. During this time, the Moon just looks a little bit dimmer.

A partial eclipse occurs when part of the Moon enters the dark center shadow, known as the umbra. A total lunar eclipse is the most exciting kind. This happens when the near side of the Moon passes entirely into the umbra. During a total eclipse, the Moon can look very bright or very dark.

One of the most amazing parts is the color change. During a total eclipse, the Moon often turns a deep red or orange. This is sometimes called a blood moon. The Moon does not go completely dark because of Earth's atmosphere. Sunlight passes through our air before it hits the Moon. The air scatters away blue and violet light. This is called Rayleigh scattering. This leaves only the longer red light to reach the Moon's surface.

This is the same thing that makes sunrises look red.

Scientists use specific names to track the timing of an eclipse. They use terms like "contacts" to mark when the Moon touches the shadow. The first contact is called P1, when the penumbra touches the Moon. The second contact, U1, is when the dark umbra touches the Moon. When the Moon is entirely inside the umbra, it is called U2. This is the start of totality. The peak of the eclipse is called the greatest eclipse.

The whole process can last for many hours. The time between the first and last contact can be up to 236 minutes.

People in the past had many different stories about these events. The ancient Greeks used lunar eclipses to show that the Earth is round. They saw the Earth's curved shadow on the Moon. Other cultures had myths about animals. The Incas and Mayans thought a jaguar was eating the Moon. In China, some people thought a dragon was biting the Moon. They even rang bells to try and scare it away.

Today, we know the science behind the beautiful red light.

A lunar eclipse is a significant astronomical event that occurs when the Moon orbits through the shadow cast by Earth. This phenomenon is often referred to as a "blood moon" because the Moon frequently takes on a reddish hue. Unlike solar eclipses, which are brief and difficult to witness, lunar eclipses are much easier to observe. Anyone located on the night side of Earth can watch the event unfold. Furthermore, lunar eclipses are completely safe to view without any special eye protection.

The mechanics of an eclipse depend on the alignment of the Sun, Earth, and Moon. These events occur during specific periods known as eclipse seasons. During these times, the Moon's orbital plane is roughly in line with the Earth and the Sun. The specific type and duration of the eclipse are determined by how close the Moon is to the lunar node.

There are three primary types of lunar eclipses based on how much of the Moon enters Earth's shadow. A penumbral lunar eclipse occurs when the Moon enters the penumbra, which is the outer, lighter part of the shadow. In this stage, the Sun is only partially blocked, resulting in a subtle dimming of the lunar surface. About one-third of all lunar eclipses are penumbral. Only 3% of these are classified as total penumbral eclipses.

A partial lunar eclipse happens when the Moon lies partially inside the umbra. The umbra is the central, darkest region of the shadow where Earth totally shields direct sunlight. During a partial eclipse, the dark region looks much more distinct than a penumbral dimming. The Moon's average orbital speed is about 3,683 kilometers per hour. This speed means totality can last up to nearly 107 minutes. The entire process from first to last contact can last up to 236 minutes.

A total lunar eclipse occurs when the Moon's near side passes entirely into the Earth's umbral shadow. As the Moon enters this stage, the entire surface becomes more or less uniformly bright, allowing surrounding stars to become visible. The Moon does not turn completely dark because of the refraction of sunlight by Earth's atmosphere. This refraction bends light into the shadow cone. The reddish coloration is caused by Rayleigh scattering. This process removes high-wavelength colors like violet and blue from the light. Only the longer wavelengths, such as red, reach the Moon and reflect back to us.

The appearance of the Moon during totality can vary significantly. This variation is measured using the Danjon scale, which rates the darkness of the eclipse from L=0 to L=4. An L=0 eclipse is very dark, making the Moon almost invisible. An L=4 eclipse is a very bright copper-red or orange. The specific color depends on the amount of dust or clouds in Earth's atmosphere. For example, large volcanic eruptions can expel dust that makes the resulting red color much deeper.

Astronomers track the timing of these events using specific contact points. The process begins with P1, or first contact, when the penumbra touches the Moon's outer limb. This is followed by U1, when the umbra touches the Moon. U2 marks the beginning of the total eclipse when the Moon is entirely within the umbra. The peak of the event is called the greatest eclipse. Finally, the Moon exits the shadow through U3 and U4 contacts, ending with P4.

Historically, different cultures developed various myths to explain these celestial changes. The ancient Greeks used the curved shadow of the Earth during a lunar eclipse as evidence that the Earth is round. In contrast, the Incas and Mayans believed a jaguar was eating the Moon. In China, some traditions suggested a dragon was biting the Moon, leading people to ring bells to scare it away. Even the ancient Mesopotamians believed seven demons were attacking the Moon and the king.