There is no scientific evidence supporting the full moon affecting panic attacks. This originated from myths saying that the full moon can affect people with mental disorders, such as panic and anxiety attacks, because it was believed to trigger lunacy.
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It takes 14 days or 15 days, half of the lunar month of 29.5 days. A full moon has the Moon behind the Earth with respect to the Sun, whereas a new moon has the Moon between the Earth and the Sun, as it orbits Earth. The Moon's orbital period is only 27.3 days, but both the Moon and Earth are revolving around the Sun, which lengthens the time between full illumination (or zero illumination) of the Moon's Earth-facing hemisphere.
When two full moons occur within one month, the second full moon is called a "blue moon." The sky is no different during this time than during any other full moon.
If you live very near the ocean, then tides will affect depth of water in harbors, when fishing is better, how far out you can wade before the water is over your head, where you should moor your boat, etc. Deeper inland, tides have no literal effect on people's activities.
About Feb 14th.
when the moon is said to be "waxing" it basically means that it's getting bigger. the sun reflects off of more of its surface that is visable to the earth. from the new moon, it slowly becomes a waxing crescent, then waxing gibbous, to eventually a full moon. then begins "waning" or getting smaller until it's back to the new moon again.