I'm trying to find out what the different phases of the moon are. Can you help?
user
Sure.  There are several lunar phases, where a full moon in the night sky looks somewhat different from a full moon in the daytime.  You can learn about the phases of the moon here.
assistant
Got it, but can you please identify the four lunar phases of the moon?
user
Yes. The phases of the moon refer to how much the moon is illuminated by the sun:

- New Moon - The moon is completely in shadow, and therefore completely dark in the night sky.  You cannot see any portion of the moon because it is completely dark.

- Waxing Crescent - The moon has started to move out of shadow and you can see a small portion of it in the night sky.  This is the first visible phase of the moon.

- Waxing Gibbous - You can see the entire upper half of the moon in the sky.  This is halfway between a crescent and a full moon.

- Full Moon - The moon is completely illuminated by the sun.  This is the brightest phase of the moon.

- Waning Gibbous - You can see the entire lower half of the moon in the sky.  This is halfway between the full moon and a crescent.

- Waning Crescent - You can see less and less of the moon as it disappears back into shadow.  This is the final visible phase of the moon.
assistant
Which moon phase is most common?
user
A waning crescent moon is most common.
assistant
How often does a full moon happen?
user
A full moon will happen about once a month.  One more common, but less exact, way to describe this is to say that there is a new moon about once a month, a waxing crescent once a month, a waxing gibbous once a month, a full moon once a month, a waning gibbous once a month, a waning crescent once a month, and a new moon once a month.
assistant
I'm trying to find out what the different phases of the moon are. Can you help?
user
Sure.  There are several lunar phases, where a full moon in the night sky looks somewhat different from a full moon in the daytime.  You can learn about the phases of the moon here.
assistant
Got it, but can you please identify the four lunar phases of the moon?
user
Yes. The phases of the moon refer to how much the moon is illuminated by the sun:

- New Moon - The moon is completely in shadow, and therefore completely dark in the night sky.  You cannot see any portion of the moon because it is completely dark.

- Waxing Crescent - The moon has started to move out of shadow and you can see a small portion of it in the night sky.  This is the first visible phase of the moon.

- Waxing Gibbous - You can see the entire upper half of the moon in the sky.  This is halfway between a crescent and a full moon.

- Full Moon - The moon is completely illuminated by the sun.  This is the brightest phase of the moon.

- Waning Gibbous - You can see the entire lower half of the moon in the sky.  This is halfway between the full moon and a crescent.

- Waning Crescent - You can see less and less of the moon as it disappears back into shadow.  This is the final visible phase of the moon.
assistant
Which moon phase is most common?
user
A waning crescent moon is most common.
assistant
How often does a full moon happen?
user
Every month, a full moon will occur on the same day of the month as the new moon.
assistant
I'm trying to find out what the different phases of the moon are. Can you help?