Black magic and moon phases: How the moon corresponds with curses and hexes. The moon has an influence on our lives, and this is as true for curses and hexes as it is for anything else. Here are some of the most common associations between witchcraft and the moon. A solar eclipse with a full or new moon is said to create the ideal conditions to perform black magic. The belief that a full moon is a good time for casting love spells and curses is widespread.