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Abstract
The four prominent phases of the lunar month are new moon, first quarter, full moon, and third quarter. According to the position of the moon in its orbit, the gravitational pull of the moon on earth changes and the amplitude of ocean tides also vary. A large number of investigations have shown the association of different lunar phases with the mental health or physical health and diseases, physical activity pattern, and reproduction of humans. The changes occurred may be due to either the disturbance of electromagnetic field of the earth or the changes of lunar gravitational force on earth and changes of “human tidal wave” or “biological tide” during different lunar phases. The altered autonomic neural activity and cardiovascular activity during different lunar phases is probably one of the fundamental causes of the changes of human physiology.