Kerenyi (Goddesses of Sun & Moon 32) say, "Seven is a lunar number: seven days signifies a quarter moon: twice seven signifies the moon's waxing or waning."
(Kerenyi; say; Seven is a lunar number: seven days signifies a quarter moon: twice seven signifies the moon's waxing or waning)
Kerenyi
say
Seven is a lunar number: seven days signifies a quarter moon: twice seven signifies the moon's waxing or waning