If you mean the name of the book, Stephine Meyer says that its called New Moon because the new moon is the darkest in the moon cycle. New Moon was the darkest time in Bella's life because she was without Edward.
If I were Stephine Meyer though, I would've had Bella get with Jacob and Edward sees how happy she is and never comes back again.
The changes are known as the phases of the moon.
The moon spins
The changes in shape that the moon goes through are called phases.
phases
Phases!
No. ADHD is not connected with moon phases; however, behavior changes have been reported during different moon phases.
changes in the Moon's visibility
moon phases
The phases of the moon as it orbits the earth
The sequential changes in the appearance of the moon are called phases. These phases include new moon, waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, third quarter, and waning crescent.
The apparent changes in the shape of the moon are called lunar phases. These phases include the waxing and waning crescent, first and third quarter, and waxing and waning gibbous, leading to the primary phases of new moon and full moon.
The periodic changes in the moon's shape are called phases. The moon goes through different phases as it orbits the Earth, including new moon, first quarter, full moon, and last quarter.