Look up at the Moon on a clear night, and you may see a round shape with one bright half and one dark half. It can look like someone has cut the Moon in two. This is called a quarter Moon, and its name can be a bit hard to grasp at first.
If we can see half of the Moon lit, why do we call it a quarter Moon? The answer is not about how much of the Moon we can see. It is about where the Moon is in its path around Earth.
The Moon goes through a set of phases as it moves around Earth. A quarter Moon marks a key point in this cycle. There are two types: the First Quarter and the Last Quarter. Both look like half a Moon, but they come at two very different times.
Why Is It Called a Quarter Moon?
The Moon takes about 29.5 days to go from one New Moon to the next. This is called a lunar cycle.
A First Quarter Moon comes about one week after the New Moon. At this point, the Moon has moved about one-quarter of the way through its cycle. That is why we call it the First Quarter.
The Last Quarter comes about three weeks after the New Moon. The Moon is now about three-quarters of the way through its cycle. It is also called the Third Quarter in some books.
So, the word "quarter" tells us where the Moon is in its cycle, not how much of its face looks bright.
Why Does a Quarter Moon Look Like Half?
The Moon does not make its own light. The Sun shines on it, and we see that light from Earth.
At all times, the Sun lights up about half of the Moon. As the Moon moves around Earth, we see the lit part from new angles. This is what makes the Moon look like it changes shape.
At the First Quarter and Last Quarter, we see about half of the Moon's face lit. The other half looks dark. This makes it look like a half circle in the sky.
The Moon itself is still round. It has not been cut in half, and no part of it has gone away. We just see one half lit and one half dark.
What Is the First Quarter Moon?
The First Quarter Moon comes after the New Moon and before the Full Moon. It is the point in the cycle when half of the Moon's face looks bright from Earth.
As the days pass after the New Moon, a thin crescent starts to grow. It gets wider each night. When it reaches the First Quarter, about half of the face we can see is lit.
After this point, the bright part keeps growing until the Moon looks full.
In the Northern Hemisphere, the right half is often lit during the First Quarter. In the Southern Hemisphere, the view is often the other way round.
The First Quarter Moon is a good time to look at the Moon with the naked eye or a small scope. The line between the bright and dark parts can make craters and hills stand out.
What Is the Last Quarter Moon?
The Last Quarter Moon comes after the Full Moon and before the next New Moon. Like the First Quarter, it looks about half lit.
The key gap is what happens next. After the First Quarter, the lit part grows. After the Last Quarter, it gets small.
In the Northern Hemisphere, the left half is often lit during the Last Quarter. In the Southern Hemisphere, this view is often the other way round.
The Last Quarter Moon is often seen late at night or in the early hours of the day. It can also be seen in the morning sky.
As the days pass, the bright half gets smaller. It turns into a waning crescent, then fades from view near the next New Moon.
First Quarter vs Last Quarter Moon
Both phases look much alike at first. Each shows about half of the Moon's face lit. The best way to tell them apart is to look at where they fall in the lunar cycle.
| Feature | First Quarter | Last Quarter |
|---|---|---|
| When it comes | After the New Moon | After the Full Moon |
| Lit part | About half | About half |
| What comes next | Waxing gibbous | Waning crescent |
| Change in light | The lit part grows | The lit part gets small |
| Place in the cycle | About one-quarter | About three-quarters |
If you see a half Moon and do not know which one it is, check the phase from the last few days. If the bright part has been growing, it is likely the First Quarter. If it has been getting small, it is likely the Last Quarter.
How Does the Moon Move Through Its Phases?
The Moon goes through eight main phases. Each one shows a new view of the part lit by the Sun.
Here is the order of the cycle:
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New Moon: The lit side faces away from us, so the Moon is hard to see.
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Waxing Crescent: A thin curve of light starts to show.
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First Quarter: Half of the face looks lit.
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Waxing Gibbous: More than half looks lit.
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Full Moon: The face looks round and bright.
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Waning Gibbous: The lit part starts to get small.
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Last Quarter: Half of the face looks lit again.
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Waning Crescent: Only a thin curve of light remains.
After the Waning Crescent, the Moon goes back to the New Moon, and the cycle starts again.
The full cycle takes about 29.5 days. It does not change from one phase to the next in a sharp jump. The lit part grows or gets small bit by bit.
When Can You See a Quarter Moon?
You do not need to wait for a dark sky to see a quarter Moon. It can be seen in the late day or at night, based on its place in the sky.
The First Quarter Moon is often easy to see in the late day and the first part of the night. It tends to rise around noon and set around midnight.
The Last Quarter Moon often rises around midnight and sets around noon. This means it can be seen in the late night, early morning, or even after dawn.
These times are only a guide. The exact rise and set times vary with the date and your place on Earth.
Clouds, trees, tall homes, and haze can also make the Moon hard to spot. On a clear day or night, look for a bright half circle in the sky.
Does a Quarter Moon Look the Same Around the World?
The Moon's phase is almost the same for people around Earth at the same time. But the way it looks can change based on where you stand.
In the Northern Hemisphere, the First Quarter Moon often has its right half lit. The Last Quarter often has its left half lit.
In the Southern Hemisphere, the view is often the other way round. Near the equator, the Moon can look more like a bowl or a smile, based on its place in the sky.
This is why a photo of a quarter Moon from one part of the world may look a bit odd to someone in a far-off place.
The Moon has not changed its phase. We are just seeing it from a new angle.
Can You See a Quarter Moon During the Day?
Yes, you can often see a quarter Moon in the day. The Moon does not only come out at night. It is in the sky for much of the month, but we do not always see it.
A First Quarter Moon can often be seen in the late day. A Last Quarter Moon can often be seen in the morning.
The Moon may look less bright when the sky is blue, but it can still stand out on a clear day. Try to look away from the Sun and never stare at the Sun to find the Moon.
How Is a Quarter Moon Different From a Half Moon?
There is no real gap in the shape. "Half Moon" is the name many people use when half of the Moon's face looks lit. "Quarter Moon" is the name used for this phase in the lunar cycle.
Both terms can point to the same look in the sky. The word "quarter" tells us that the Moon is about one-quarter or three-quarters of the way through its cycle.
This is why a quarter Moon can seem to have the wrong name. The name is about time in the cycle, not the part of the Moon that is bright.
Common Myths About the Quarter Moon
The Moon is cut in half
No. The Moon stays round. We see only half of its face lit at this stage.
The Earth blocks the Sun's light
This is not what causes a quarter Moon. The Moon's own place around Earth changes how much of its sunlit side we can see. Earth's shadow causes a lunar eclipse, which is a different event.
A quarter Moon means only one-quarter is lit
No. About half of the Moon's face is lit during both quarter phases. The name refers to the Moon's place in its cycle.
The First and Last Quarter are the same phase
They look much alike, but they come at different points in the cycle. One comes before the Full Moon, and the other comes after it.
How to Track the Moon's Phase
One easy way to learn the Moon's phases is to look at it each night for a week or two. You can draw its shape in a book or take a photo from the same spot.
Look at how much of the Moon is bright. Does the lit part grow each night, or does it get small? This can help you tell if the Moon is waxing or waning.
You can also use a Moon phase chart or an online phase tool to check the date of the First Quarter or Last Quarter. For more Moon phase facts, visit https://moonphaseemoji.com/.
FAQs About the Quarter Moon
Why is it called a quarter Moon if half is lit?
It is called a quarter Moon because it marks a point about one-quarter or three-quarters of the way through the lunar cycle. The name does not mean that only one-quarter of the Moon is lit.
How many quarter Moons are there?
There are two main quarter phases: the First Quarter and the Last Quarter. Both show about half of the Moon's face lit.
How long does a quarter Moon last?
The exact quarter phase is a point in time, not a long stage. The Moon looks close to half lit for a short span around that point, as the lit part changes each day.
Is the First Quarter Moon growing or getting small?
The First Quarter Moon is waxing. The lit part keeps growing after this phase until the Full Moon.
Is the Last Quarter Moon growing or getting small?
The Last Quarter Moon is waning. The lit part keeps getting small as the Moon moves toward the New Moon.
Can I see a quarter Moon with no tools?
Yes. You can see it with your eyes on a clear day or night. A scope can help you see more detail on the Moon's face, but it is not needed to tell the phase.
Does the Moon change its shape?
No. The Moon stays round. The Sun lights up one half, and we see more or less of that lit half as the Moon moves around Earth.
Final Thoughts
A quarter Moon is a key part of the Moon's cycle. It looks like half of the Moon's face is lit, but its name tells us where the Moon is in its path around Earth.
The First Quarter comes before the Full Moon, as the lit part grows. The Last Quarter comes after the Full Moon, as the lit part gets small.
The next time you see a half Moon, take a moment to look at it. With a bit of care, you can learn which quarter it is and see how the Moon changes from night to night.