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The Earth follows the same laws as all other bodies of the same system.
But if we imagine the Earth to be stationary in space and the centre around which the planets revolve, their motions present several irregularities.
When at aphelion the planets move slower, and when at perihelion they move quicker than at the mean distance.
Astronomers employ an imaginary circular orbit for the planets, in which they move at an uniform rate of velocity, which is called the mean motion.
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.
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.Incomplete as it must needs be, it is yet a veritable science both as to its principles and practice.It claims for itself a place among the sciences for the sole reason that it is capable of mathematical demonstration, and deals only with the observed positions and motions of the heavenly bodies; and the man who holds to the principia of Newton, the solidarity of the solar system, the interaction of the planetary bodies and their consequent electrostatic effects upon the Earth, cannot, while subject to the air he breathes, deny the foundation principles of astrology.He wrote the Tetrabiblos, or Four Books, and laid the foundations of a true astrological science.Julius Firmicus confirmed Ptolemy and enlarged upon his observations.