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The four principal phases of the Moon are new moon, first quarter, full moon, and third quarter (also known as last quarter). These are the instances when the Moon’s ecliptic longitude and the Sun’s ecliptic longitude differ by 0°, 90°, 180°, and 270°, respectively.

The branches of contemporary science associated with the study of human nature include anthropology, sociology, sociobiology, and psychology.

Human nature

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