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.
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.
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.
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.
Not that these discoveries overturned the whole system of astrology, as some have imagined and foolishly stated, or that they negatived the conclusions drawn from the observed effects of the seven anciently known bodies of the solar system, but it became possible after a lapse of time to fill in the blank spaces and to account for certain events which had not been traced to the action of any of the already known planets.
The other planets, having orbits greater than that of the Earth, will appear to revolve around it at constantly varying distances and velocities.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.The literature of the subject is considerable, and the present writer only takes credit to himself so far as his own wide experience and practice have enabled him to present the subject in a simple and brief manner.The luminaries and planets are known to astronomers under the following names and symbols:— The Sun ☉, Moon ☽, Neptune ♆, Uranus ♅, Saturn ♄, Jupiter ♃, Mars ♂, Venus ♀, and Mercury ☿.