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A blue moon is a phase that traditionally loosens the bonds of magic, on the three days when the blue moon rises. It can wreak havoc with all magical forces, causing witches' powers to become erratic and unpredictable or even ineffective. However, this is only temporary and only lasts while the blue moon is present.
While some witches may find the ties between themselves and their powers weakened, the Charmed Ones will have an added worry, because not only will the ties between each sister and her powers lessen, but each sister's bond to each other will be weakened as well, thus weakening the Power of Three as a whole, which makes it easier for evil to attempt to destroy it. It is imperative that the Power of Three be guarded on this day.
Influence on the Charmed OnesEdit
On the second blue moon of a year (this only occurs once every fifty years), the Charmed Ones turned into werewolf-like creatures and attack beings of good magic, most likely Elders and Whitelighters. Aside from the transformation, Piper's temper will increase, making her easily angered and her power of Molecular Combustion randomly blow up anything in her surrounding. Meanwhile, Phoebe saddens easily. Since her power is passive, she didn't show an unstable use of it, though she did suffer from violent and painful nightmares (presumably from her Premonition power). And Paige gets jumpy, which causes her to orb out and then back again on the same place and loses control of orbing objects easily. All of this passes after the last night of the blue moon.
- In "Once in a Blue Moon" it is revealed that every time there are two Blue Moons in a year, the Charmed Ones transform into werewolf-type beasts. According to the show, two blue moons in a year appear every 50 years. Astronomically speaking, there are 3-4 different years each century that will contain two Blue Moons. During these special years, the Blue Moons must take place in January and March.
- In the past few decades, the definition of a Blue Moon has come to mean two full moons in the same month. Historically, it was the third full moon in a season with four full moons (there are 13 full moons in a lunar cycle). According to the former, a Blue Moon occurs roughly every three years.
- Additionally, in reality the blue moon is merely a term, and has nothing to do with the actual color of the moon.
- Itis possible their powers' emotional triggers are what caused their instability: Piper's Molecular Combustion trigger being anger and Paige's trigger being fear. This could also explain why Piper's Molecular Immobilization power didn't malfunction.
- Even though Phoebe doesn't have a known trigger for her Premonition power it's possible that her power instability due to her excesive sensitivity and sadness comes from her power connection which is seeing and feeling.