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This is subject to an equation depending on the position of the planet in its orbit, and it determines the difference between the imaginary planet and the true planet.The equation itself depends on the eccentricity of the orbit, that is to say, its relation to a circle drawn around the same focal centre.
Were the orbits of the planets circular and the Sun holding the centre of the circle, their motions would be constant, that is to say, always in the same direction and at the same rate.Neptune revolves around the Sun in its distant orbit once in about 165 years.Uranus completes its orbital revolution in 84 years, Jupiter in 12 years, Mars in about 15 months, Venus in 11 months, and Mercury in 18 weeks.As far back as the year 2154, we find mention of the great importance attaching to the celestial phenomena in the minds of Chinese rulers.
It is recorded in the Historical Classic of China that at that time the astrologers Hi and Ho neglected their duties so that when, on the 10th of October, there was a great eclipse of the Sun at Peking between seven and nine o’clock in the morning, the people were wholly unprepared for it, and “ran about here and there in the utmost consternation.” For this offence Hi and Ho were deprived of their offices, their estates were confiscated and they were driven from the kingdom.
He wrote the Tetrabiblos, or Four Books, and laid the foundations of a true astrological science.