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Astro*Dictionary by Michael Erlewine





7 articles for "Planetary"

Planetary Aberration [Munkasey M.]

The apparent displacement of the light from heavenly bodies caused by the Earth's orbital motion. As the light leaves a body and travels toward the Earth, moving in its orbit, the light seems to come from a different position from that occupied by the body. The maximum aberration is about 20.5 seconds of arc.

See also:
♦ Aberration
Planetary Aberration [Astro*Index]

Because the velocity of light is finite, the apparent direction of a moving celestial body from that of a moving observer differs from the geometric direction of the object from the observer at the same moment. This displacement, from geometric to apparent position, can be separated into two parts:

(1) Light-time Correction (which is independent of the motion of the observer).
(2) Stellar Aberration (which is independent of the motion or distance of the object).

The sum is known as Planetary Aberration. It is important that all computations be made with respect to an inertial frame of reference, such as the mass centre of the Solar System (not the Sun's center).

See also:
♦ Barycenter ♦ Light-time Correction ♦ Stellar Aberration ♦ Aberration
Planetary Angels [DeVore]
See also:
♦ Angels
Planetary Day [Astro*Index]

Horary Astrology and Electional Astrology.

Planetary days are used in horary astrology and electional astrology as part of a general test to determine whether a chart is radical, the day ruler being compared to the nature of the querent and the quesited for broad symbolic resonance. The "Sun's day" is Sunday and the "Moon's day" is Monday. Tuesday belongs to Mars, Wednesday to Mercury, Thursday to Jupiter, and Friday to Venus. "Saturn's day" is Saturday. As you can see, not all the day's names have come into English philologically linked to English planet names. The god Tiw (also Tiu) is the Saxon equivalent of Jove, Jupiter, or Zeus: a god of war and the sky. The god Woden came into Germanic cultures from the Old Norse Odin, that culture's chief god, reigning over art, war, and the dead. Thor is well-known as the Norse god of thunder, also of war and strength; he was the son of Odin. Frigg, or Freya, is the Saxon/Norse equivalent of Venus, goddess of love and beauty. "Mittwoch" simply means "midweek." "Donnerstag" means "thunder's day."


Sun's DaySamstagSolLe Dimanche
Moon's DayMontagLunaLundedi
Tiw's DayDienstagMartisMartedi
Woden's DayMittwochMercuriusMercredi
Thor's DayDonnerstagJoveJeudi
Frigg's DayFreitagVenerisVendredi
Seterne's DaySamstagSaturniSamedi


See also: ♦ Planetary Hours ♦ Horary Astrology ♦ Electional Astrology ♦ Radical ♦ Ruler ♦ Querent ♦ Quesited
Planetary Hours [DeVore]

Egyptian astronomy had only seven planets, arranged in this order: Saturn, Jupiter, Mars, Sun, Venus, Mercury, Moon — based seemingly on the apparent velocities of the bodies. In rotation, each hour of the 24-hour day was consecrated to a planet. If Saturn ruled the first hour, it also ruled the 8th, 15th and 22nd. As Jupiter would then rule the 23rd, and Mars the 24th hour, the first hour of the following day would be ruled by the Sun; and so on. The days thus came to be known by the ruler of the first hour, resulting in our present order of the days of the week. Thus the order of the days of the week, which can be hormonized with no observable cosmic plan, are explainable only by a student of astrology. The hatred of the Jews for the Egyptians after their flight from Egypt is said to have caused them to "demote" Saturn from the rulership of the first day, by beginning the week on Sunday, making Saturn's day the last day of the week. Probably some symbolical association of the Sun with the Hebrew idea of Jehovah, had something to do with it. The evolution of the English names of the days, from the Latin, through the Saxon, resulted as follows:


Norse    LatinFrenchSaxonEnglish
SolLe Dimanche   Sun's daySunday
LunaLundiMoon's dayMonday
TyrMartis (Mars)MardiTiw's dayTuesday
WotanMercuriusMercrediWoden's dayWednesday
ThorJove (Jupiter)JeudiThor's dayThursday
FreyaVeneris (Venus)  VendrediFrigg's dayFriday
SaturniSamediSeterne's day   Saturday


Under this system an hour was not uniformly 60 minutes, except at the equinoxes. It was onetwelfth of the interval between sunrise and sunset, by day; and the reverse, by night. A planet favorably aspected suggests that action be initiated during that planet's hour; or if unfavorably aspected, that one should wait for others to act. Wilson goes to some length in expressing doubt as to the efficacy and logic of this system.

The astonishing thing about this sequence is the placing of the Sun between Venus and Mars, showing that the ancients realized that in speaking of the Sun they were actually making reference to the position of the Earth as determined by the apparent position of the Sun.

See also:
♦ Horary Astrology ♦ Essential Dignity ♦ Accidental Dignity ♦ Ptolemy ♦ Significator ♦ Lilly, William
Planetary Nebula [Astro*Index]

A spherical shell of expanding gas probably ejected from a hot star at its center. These small luminous nebulae, more or less circular in form, are called "planetary" because under low magnification they resemble the disks of planets. They usually contain hot central stars apparently evolving to the white dwarf stage. The gaseous shell is thought to have been ejected from the central star. (A well known example is the Ring Nebula in Lyra.)

See also:
♦ White Dwarf ♦ Nebulae
Planetary Node [Astro*Index]

The intersection of the plane formed by a planetary orbit and any other important plane, such as that of another planet, the Ecliptic, the invariable plane, etc. This intersection forms a line, and the line's intersection with the celestial sphere, projected on the Ecliptic, gives two points, or nodes. These nodes can be interpreted as sensitive points.

See also:
♦ Ecliptic ♦ Invariable Plane ♦ Celestial Sphere ♦ Sensitive Point
Planetary Motion [Prima]

The planets always have a forward motion, but when viewed from the earth, their speeds at times appear faster or slower. The planets will also appear to come to a halt and reverse direction. There are usually three main phases to a planet's apparent motion:

            Direct Motion       Retrograde Motion       Stationary

A planet's motion can be averaged over a specific period of time, as its mean motion may vary from century to century. Rapid motion is one of the factors that bestows dignity on a planet — slow motion bestows debility.

See also Daily Motion.

See also:
♦ Direct Motion ♦ Daily Motion ♦ Retrograde Motion ♦ Stationary
Planetary Strength [Astro*Index]

Horary astrology.

A system of essential and accidental dignity and debility whereby planets are rank-ordered for strength and effectiveness in a chart. In questions of a win/lose nature, the person represented by the strongest significator would be likely to win.

See also:
♦ Horary Astrology ♦ Essential Dignity ♦ Accidental Dignity ♦ Ptolemy ♦ Significator ♦ Lilly, William


Astro*Index Copyright © 1997 Michael Erlewine


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