Monday is named after the moon. The Latin term for Monday is Dies Lunae (“moon’s day”); in the Old English language, this day was Monandaeg; in Greek, it was Hermera Selenes. All of these different names and languages translate to the same thing: the “day of the moon.”
Working with the different phases of the moon is an important skill that takes a bit of time for Witches to learn. So why not cut to the chase and experiment with the day of the week that is dedicated to the moon in all of its magickal energies and aspects?
Magickally, Monday encourages the lunar energies of inspiration, illusion, prophetic dreams, emotions, psychic abilities, travel, women’s mysteries, and fertility.
–Ellen Dugan, Book of Witchery: Spells, Charms & Correspondences for Every Day of the Week