The phases of the moon form an important part of a witches practice, whether one simply keeps their eye upon the sky to acknowledge the moons movements or participates eagerly in Esbats i.e. full moon rituals that celebrate the moon's great feminine energy. As the moon enters into different phases, its energy and how it affects the inhabitants of earth is altered.
The Athame represents the Element of Air and is the ceremonial knife, the first of the four major sacred tools. It symbolizes the GodLord of Manifestation and in the AltarGreat Ritesee chalicerepresents the phallus of the GodTraditionally Athames have a double edged bladethis is so that you may both Cast and Open a Magick Circle without turning your knife overThe double edge also is symbolic of the duality of naturethe Goddess and Godyin and yang http://sacredwicca.jigsy.com/ritual-tools