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Not all of the are considered negative. Some suspect that the flow of blood responds to the gravitational tug of the Moon. Believers in the power of the Moon consider dental care and elective surgery unwise around the times of the full Moon because of the risk of increased bleeding. (Civil War doctors noted greater blood flow during a flood tide.)
The power of the Moon in Wicca cannot be overstated. The Moon is our closest celestial neighbour. Although it is so much smaller than the sun, and gives much less light, it strongly affects the Earth. In terms of gravitational force, this small satellite exerts two and a half times the gravitational pull of the sun. The Moon's powerful pull influences on every living thing on our planet. It creates tides on every scale.