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6The sun, in the course of a month, passes through the space of one sign which is a twelfth part of the heavens; hence in twelve months going through the twelve signs, when he has returned to that sign from which he set out, the period of a year is completed: but that circle which the moon passes through thirteen times in twelve months, the sun passes through only once in the same time. The planets Mercury and Venus nearest the rays of the sun, move round the sun as a centre, and appear sometimes retrograde and sometimes progressive, seeming occasionally, from the nature of their circuit, stationary in the signs.
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