moon
The word 'lune' corresponds to the English word 'moon'. It is predominantly used in any context concerning the Earth's moon. For example, in sentences concerning moon phases, 'phase de la lune' or when talking about something under the moonlight, 'au clair de la lune'. Remember, unlike in English, 'lune' is feminine in French, so remember to use 'la' instead of 'le' before it.
The Moon is blue in the sky.
This sentence describes the color of the moon.
I am going to the moon tomorrow night.
This sentence expresses someone's intention to travel to the moon.
There will be a lunar eclipse tonight.
This sentence states that there will be an astronomical event involving the moon.
The dog is lying under the moon.
This sentence describes the location of an animal relative to the moon.