The moon doesn't actually produce any light of its own. Il brille car il reflète la lumière du soleil. The reason why it appears dark at one stage of the lunar cycle is due to the relative positions of the sun, Earth, and the moon:

* New Moon: During this phase, the moon is positioned between the sun and Earth. Son côté ensoleillé est face à nous, ce qui le rend complètement sombre.

* Crescent d'épilation: As the moon orbits Earth, it starts moving away from the sun's position. A sliver of the sunlit side starts becoming visible, appearing like a crescent.

* premier trimestre: At this stage, the moon is positioned at a 90-degree angle to the sun and Earth. Half of its surface is illuminated, creating a half-moon shape.

* Gibbous à la cire: As the moon continues its orbit, more of the sunlit side becomes visible, resulting in a larger, gibbous shape.

* pleine lune: The moon is opposite the sun, directly across from Earth. The entire sunlit side of the moon faces us, giving us a full, bright moon.

* baissant Gibbous: After the full moon, the illuminated portion of the moon starts decreasing, moving back into a gibbous shape.

* dernier trimestre: Again, the moon is at a 90-degree angle to the sun and Earth, but this time the opposite half is illuminated, creating another half-moon shape.

* Croissant décroissant: The illuminated portion of the moon continues to shrink, becoming a thin crescent before disappearing completely at the next new moon.

Therefore, the moon appears dark during the new moon phase because the sunlit side is facing away from Earth.