Moon Phases: What They Are And Why The Moon Changes Shape
The moon is a big round ball of rock that flies around the Earth. But the moon does not make its own light. The light we see at night is just the sun's light bouncing off the moon. That is the whole secret behind the moon phases.
Every day, the moon moves a little more around the Earth. As it moves, the sun lights up a different part of the moon. So from our home on Earth, the moon looks like it is changing shape. It is not really changing — we are just seeing a different slice of the lit side.
There are 8 moon phases in one full lunar cycle. We give each one a name, and each one has its own moon emoji. Together, the 8 phases make one lunar cycle, which lasts about 29 and a half days. After that, the whole thing starts again from a new moon.
The 8 Moon Phases In Order
Here is the full moon phase emoji list, in the same order the moon follows every single month. If you learn these 8 moon emojis, you can always read the real moon in the sky like a picture book.
- New Moon — the moon is dark and we can barely see it.
- Waxing Crescent — a tiny sliver of light grows on the right.
- First Quarter — half of the moon is lit on the right side.
- Waxing Gibbous — more than half is lit and still growing.
- Full Moon — the whole round moon is bright and glowing.
- Waning Gibbous — the moon begins to shrink back from full.
- Last Quarter — the other half is now lit, on the left side.
- Waning Crescent — only a thin curved sliver of light remains.
Current Moon Phase: The Real Moon Right Now
Look up at the moon tool at the top of this page. That is the current phase of the moon emoji, and it matches the real moon in the sky at this very moment. The tool checks the real lunar cycle, so it is always right.
The current moon phase changes about every 3 to 4 days. So if today is a waxing crescent, in a few days the moon will grow into a first quarter moon. Watching the current moon phase day by day is like watching a slow, beautiful story happen above your head.
Some people only care about the current moon phase emoji so they can paste it into a message or a game. That is totally fine too. Just tap the copy button and the moon emoji is yours. But it is even nicer to know what the emoji really means.
Why The Current Moon Phase Emoji Is Useful
The current moon phase emoji is a quick little picture that shows what the real moon looks like today. Instead of writing a long sentence like 'the moon is a waxing crescent right now,' you just send one emoji: 🌒. Everyone understands it in a second.
People use the current moon phase emoji for all sorts of things. Artists draw it into their pictures. Friends send it to each other to say 'look at the moon tonight.' Some games even ask you for the current moon phase emoji to unlock a level.
Moon Emoji And Moon Emoji Meaning
A moon emoji is a tiny picture of the moon that you can type on a phone or a computer. There are 8 main moon phase emojis, plus a few extra moon emojis that have little faces on them. Each moon emoji has its own meaning.
The moon emoji meaning is simple: each emoji shows one of the 8 moon phases. When you see 🌕, that moon emoji means a full moon. When you see 🌑, that moon emoji means a new moon. The crescent moon emoji 🌒 means a waxing crescent, which is the moon just starting to grow.
There is also a crescent moon symbol 🌙 that is not a phase emoji. That one is a decorative moon symbol used for decoration. It does not show a real lunar phase, so it is not the one you want if you need the correct emoji for today.
Moon Emojis With Faces
Besides the 8 phase emojis, there are 4 moon emojis that have cute little faces. These moon emojis are fun to use, but they are not meant to show the real lunar phase. They are just for playing and chatting.
- Full Moon With Face — a smiling full moon.
- New Moon With Face — a dark moon with a face.
- First Quarter Moon With Face — a half moon looking at you.
- Last Quarter Moon With Face — the other half moon with a face.
How The Moon Phase Is Calculated
The moon phase is not a guess. It is real math. Astronomers (the people who study the sky) know exactly where the moon is at every minute of every day. They use something called the lunar cycle, which is about 29.53 days long.
Here is the simple idea. We start counting when the moon is brand new. That is day zero. Every day after that, the moon grows by a tiny amount. After about 7 days it is a first quarter moon. After about 15 days it is a full moon. After about 22 days it is a last quarter. And after about 29 and a half days, we are back to a new moon again.
The tool on this page does the same math the big space agencies use. It checks the date, counts the days since the last new moon, and works out which phase the real moon is in. That is why the current phase of the moon emoji is always correct.
Illumination: How Much Of The Moon Is Lit
Illumination is a fancy word for 'how much of the moon is lit up.' A new moon has an illumination of 0%, because none of the side we see is lit. A full moon has an illumination of 100%, because the whole side we see is lit.
Every moon phase has its own illumination. A waxing crescent is between 1% and 49% lit. A first quarter moon is about 50% lit. A waxing gibbous is between 51% and 99% lit. Watching the illumination go up and then come back down is a nice way to see the lunar cycle in action.
The tool at the top of this page shows the real illumination for today. So if it says 23%, that means about one quarter of the moon's face is glowing right now. The rest is in shadow. It is like a dimmer switch for the moon, going slowly up and slowly down.
Crescent Moon And Gibbous Moon: The Two Shapes You See Most
You will see two shapes more than any others: the crescent moon and the gibbous moon. They sound tricky, but they are easy once you know the trick.
A crescent moon is when only a thin sliver of the moon is lit. It looks like a curved banana or a smile. There are two crescent phases: the waxing crescent, which is growing, and the waning crescent, which is shrinking. Both use a crescent moon emoji.
A gibbous moon is when most of the moon is lit, but not all of it. It looks like a fat oval, almost a full circle but with a little bite taken out. There are two gibbous phases too: the waxing gibbous and the waning gibbous. So whenever you hear 'gibbous moon,' think 'almost full moon.'
Waxing Crescent, Waning Crescent, And The Real Lunar Cycle
The word 'waxing' just means 'growing.' The word 'waning' just means 'shrinking.' That is all there is to it. A waxing crescent is a crescent moon that is getting bigger every night. A waning crescent is a crescent moon that is getting smaller every night.
Put all the phases together and you get the real lunar cycle. It starts with a new moon. Then a waxing crescent grows. Then a first quarter. Then a waxing gibbous. Then the big bright full moon. Then a waning gibbous shrinks. Then a last quarter. Then a waning crescent. Then we are back to a new moon.
This lunar cycle has been going on for billions of years, long before there were any people to watch it. The dinosaurs saw the same moon phases we see today. The lunar cycle is one of the oldest patterns in the whole sky.
Today's Moon Phase And The Moon Phase Calendar
Today's moon phase is whatever the moon is doing right now. You can see it at the top of this page. But what if you want to plan ahead? That is where the moon phase calendar comes in.
A moon phase calendar is a normal calendar, but each day has a little moon emoji next to it. That way you can see the whole lunar cycle at a glance. You can look at next week and know that a full moon is coming. You can look at next month and find every new moon and full moon.
We have a free moon phase calendar page on this site. You can pick any month and any year, and it will show you the moon emoji for every single day. It is the easiest way to follow the lunar cycle over a long time.
The Blood Moon: When The Moon Turns Red
Sometimes, on very special nights, the moon turns a deep red color. People call this a blood moon. It does not happen every month. A blood moon only happens during a lunar eclipse, when the Earth slides right between the sun and the moon.
When that happens, the Earth blocks the bright sunlight. But a little bit of light sneaks around the Earth, through our air, and lands on the moon. Our air turns that light red, the same way a sunset turns red. So the moon glows like a dull copper penny in the sky.
Our moon tool checks for blood moons too. If a blood moon is happening right now, the tool will tell you. And if one is coming up soon, you can see the date in our lunar eclipse calendar. Blood moons are rare, so when one comes, it is worth going outside to look.
Astronomy And The Real Moon In The Sky
Astronomy is the science of the stars, the planets, and the moon. People who study astronomy use big telescopes to learn how the sky works. But you do not need a telescope to enjoy astronomy. Your eyes are enough to see the real moon and watch the moon phases change.
The real moon is about 384,400 kilometers away from the Earth. That is so far that a fast rocket still takes three days to get there. Even so, the moon is close enough that we can see its shape clearly. The moon emoji you copy from this site is a tiny picture of that real moon.
If you want to see the real moon tonight, just step outside after the sun goes down. Look up. Whatever shape you see — a crescent, a half, or a big round full moon — that is the same shape shown by the current moon phase emoji at the top of this page.