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.
When at aphelion the planets move slower, and when at perihelion they move quicker than at the mean distance.
The Greek mythology is nothing but a vast system of cosmographical astrology, and there is no other history in it than what you may read in the constellations of the heavens and the corresponding evolution of the human race. Hipparchus, Hippocrates, Thales, Galenius, and others subscribed an intelligent belief in its principles.
To Claudius Ptolemy, however, we are indebted for the first concise and scientific statement of its principles and practice, so far as Europe is concerned.
Mercury and Venus will then appear to revolve around the Sun while the Sun revolves around the Earth, sometimes being between the Earth and the Sun, which is called an Inferior conjunction, sometimes on the further side of the Sun away from the Earth, as at their Superior conjunction; and again, at other times to the right or left of the Sun, in East or West elongation.
The other planets, having orbits greater than that of the Earth, will appear to revolve around it at constantly varying distances and velocities.
It is not possible within the limits of a small handbook such as this to adequately consider the philosophic paradox which makes of Freewill in man a “necessity in play”; but it is obvious that the concept is not altogether unscientific, seeing that it is customary to speak of the “free path of vibration” in chemical atoms while at the same time it is known that these atoms have their restricted characteristics, modes of motion, &c., and are all subject to the general laws controlling the bodies of which they form integral parts.
Let it suffice that if we can trace an actual connectedness between the disposition of the heavenly bodies at the moment of a birth and the known life and character of the individual then born, and an exact correspondence between the course of events in that life with the changes occurring in the heavens subsequent to the moment of birth, we shall do well to accept the fact for what it is worth, and arrange our philosophic notions accordingly.
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.
Among the Hindus we have the classical writers Garga, Parashara, and Mihira, together with their legions of commentators.
The Assyrian records are full of astrological allusions regarding the influence of planetary conjunctions and stellar positions.
The subsequent discovery of the planets Uranus and Neptune by Herschel and Adams, widened the field of research and gave to later astrologers the clue to much that hitherto had been imperfectly understood.