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They only happen at night, during a full moon, and when the Earth, sun, and moon are aligned.
A lunar eclipse happens when the Earth passes between the moon and the sun, and the Earth's shadow completely or partially obscures the moon.
What Is a Lunar Eclipse?
There are, on average, three lunar eclipses a year, but not all of them are total eclipses.
An eclipse occurs when one object in space blocks an observer from seeing another object in space.
Unlike solar eclipses, lunar eclipses can be viewed without any special equipment and without any danger to your eyes.
Did You Know?
Because the moon reflects the sun’s light, a lunar eclipse will never be brighter than a full moon.
There are two main types of eclipses from Earth: solar and lunar.
The Earth casts two different shadows as it blocks the sun’s light during a lunar eclipse.
Parts of the Eclipse
Penumbra
Umbra
Turn and Talk
What causes a lunar eclipse, and how does it differ from a solar eclipse?
This is when the moon passes completely into the umbra, or total shadow, of the Earth.
If the moon is completely in the Earth’s shadow, why does it look red and not dark?
Types of Lunar Eclipses
It’s because of the Earth’s atmosphere. The sun’s rays pass through the ring of atmosphere around the Earth and are filtered. It is mostly red light that passes through and is refracted onto the moon’s surface, making it appear red. Some people call this a "blood moon."
Total Lunar Eclipse
Total Lunar Eclipse
Stages of the Total Lunar Eclipse
This is when the moon does not fully move into the umbra.
Types of Lunar Eclipses
Partial Lunar Eclipse
i
“PARTIAL LUNAR ECLIPSE” by [tonynetone] is licensed under CC BY 2.0
the Earth’s shadow covering a small amount of the moon
Turn and Talk
Can you describe a time when you observed the moon looking different? How might that experience relate to what we've learned about lunar eclipses?
A supermoon happens during a full moon when the moon is at its closest point to Earth. The moon appears bigger and brighter in the sky than usual.
A "wolf moon" is the name of the first full moon of the year in January. It was so-called by Native American tribes and Europeans alike as it occurs during the winter when wolves are often heard howling.
What Is a Super Blood Wolf Moon?
On January 21, 2019, a total lunar eclipse (blood moon) happened during the first full moon of the year, which was also when the moon was at its closest point in orbit.
Thus, this special event earned the nickname “Super Blood Wolf Moon.”
What Is a Super Blood Wolf Moon?
Super Blood Wolf Moon of 2019, not yet at total eclipse
The following year, the wolf moon occurred during a penumbral eclipse.
Wolf Moon 2020
the wolf moon of 2020 (January 10th)
Check to see when the next lunar eclipse will occur.
Be on the nighttime side of the Earth when it happens!
Watch the full moon from a spot without tall trees or buildings.
The whole eclipse may take a few hours, but if you are in the umbra, the total eclipse (when the moon turns red) may last only an hour.
How To Get The Best View
Exit Ticket
Write down one thing you learned about lunar eclipses from today's presentation. It could be a new fact, an interesting detail, or something that surprised you.