new moon
US /nuː muːn/
UK /nuː muːn/

1.
luna nueva
the phase of the moon when it is in conjunction with the sun and invisible from Earth, or shortly thereafter when it appears as a slender crescent.
:
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The sky was dark, signaling the arrival of the new moon.
El cielo estaba oscuro, señalando la llegada de la luna nueva.
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Many cultures celebrate festivals during the new moon.
Muchas culturas celebran festivales durante la luna nueva.