PERIODIC

, or Periodical, appertaining to Period, or going by periods. Thus, the Periodical motion of the moon, is that of her monthly period or course about the earth, called her Periodical month, containing 27 days 7 hours 45 minutes.

Periodical Month. See Month.

PERIŒCI, or Perioecians, in Geography, are such as live in opposite points of the same parallel of latitude. Hence they have the same seasons at the same time, with the same phenomena of the heavenly bodies; but their times of the day are opposite, or differ by 12 hours, being noon with the one when it is midnight with the other.

PERIPATETIC Philosophy, the system of philosophy taught and established by Aristotle, and maintained by his followers, the Peripatetics. See ARISTOTLE.

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Entry taken from A Mathematical and Philosophical Dictionary, by Charles Hutton, 1796.

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