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A Glossary of Astrological Terms for the letter "O"

Use this glossary to look up the meanings of words you come across on this website, or in your astrological reading. Just select the first letter of the word you need and click on it in the table below to go straight to that sector.
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Go to Top Obliquity
The angle formed between the ecliptic (the plane of the Earth's orbit) and the celestial equator. Currently this "tilt" of the Earth is about 23°27' and decreasing by about one minute every 128 years. This factor is responsible for some signs rising faster than others (long and short ascension).
Go to Top Occidental & Oriental
  1. From cusp of tenth house westward to fourth via the descendant is occidental. The opposite half is oriental.
  2. To be "oriental in the figure" means being near the Ascendant, best suited to the Sun; to be "occidental in the figure" means being near the Descendant, best suited to the Moon.
  3. Planets are sometimes described as being occidental or oriental of the Sun. Occidental means setting after the Sun so visible in the evening; oriental means rising before the Sun, so visible in the morning.
Ptolemy says: "When oriental, the influence is masculine; when occidental, feminine." This is a subtle influence, but he also says oriental planets are more powerful, especially when increasing in speed ("adding to proper motion"). Oriental planets are said to have "more height and hair", meaning that they have such an effect on the appearance of the native.
Go to Top Occult
Hidden, or concealed.
Go to Top Occult Knowledge
Secret knowledge, known only to the initiated.
Go to Top Occultation
Planets occasionally obscure other planets or stars temporarily. The Moon, transiting a variable orbit, does so frequently. The phenomenon is termed occultation to distinguish it from eclipses. An occultation is equal to a powerful total or partile conjunction. [To be actually partile, these bodies should at the time have the same latitude and longitude.]
Go to Top Octile
Minor adverse aspect of 45°. Called octile because it marks of the 360° circumference of the circle of the zodiac. More widely known as a semi-square.
Go to Top Old Aspects
Major Aspects.
Go to Top Ophiuchus
The Serpent-Bearer, the so-called "13th Sign" of the Zodiac. Ophiuchus (a.k.a. Serpentarius) was one of the 48 constellations listed by Ptolemy, but even though it lay on the ecliptic, was never considered a Sign of the Zodiac. The zodiacal Signs are particular divisions of the circle of the ecliptic into 12 equal parts of 30° each, based on the seasonal changes marked by the Equinoxes and the Solstices. Despite their names, the positions of the stellar constellations nowadays have no direct connection with the Signs, at least not in Western Tropical Astrology (compare Sidereal Zodiac).
Go to Top Opposition
A generally adverse aspect of 180 degrees, depending on the planets involved, usually considered malefic (unfavourable). There is some discussion in astrological circles as to whether the opposition or the square is the most damaging, because the square always counters masculine to feminine signs, while the opposition counters signs of the same polarity, although different elements. An example of an opposition would be a planet at 15 Aries (Fire) aspecting another planet or point at 15 Libra (Air). The opposition aspect in modern astrology is given an orb of 6–8, but the closer the orb is to being exact (partile), the more powerful the effect. The Sun and Moon are often allowed more orb. Classical astrology allows for signs to be in aspect, so any planet in Aries would be considered opposed to any planet in Libra for example, as these signs are diametrically opposed in the zodiac. This called a platic aspect, as opposed to partile. More on Aspects, and Planets.
Go to Top Orb
An aspect between planets or sensitive points is usually allowed some inexactitude, which is called its orb of influence. This comes from the idea of a halo or aura surrounding a planet, comprising its rays. Traditional astrology allows different orbs for each of the planets, but modern astrology works primarily on an orb of aspect. Major aspects are allowed a greater orb than minor ones. For example, a conjunction is usually allowed an orb of 8 degrees, whereas a semi-sextile would only be allowed an orb of 2 degrees of arc. The Moon is usually allowed more orb than other planets, while faster planets are allowed more orb than slower ones. Greater orb is allowed in natal astrology than in mundane, where timing is more critical. See also Moiety.
Go to Top Orbit
Path described by an astronomical body (such as a moon or a planet) in its motion though space around another astronomical body (such as a planet or a star).
Go to Top Oriental
See Occidental & Oriental.
Go to Top Oriental Appearance
Planet rising just before the Sun. Said to stand for special skills and faculties in a natal chart.
Go to Top Out of Bounds
When a planet by declination moves beyond the boundaries of the band of the ecliptic (2326'22" north or south of the equator). This is especially significant for the Moon, but other planets can also move out of bounds. Generally considered a debility, this placement can also mark eccentricity, even genius in a nativity — and truly remarkable events by progression. When a planet is out of bounds, its expression is greatly intensified. Note that Mars was out of bounds at the time of the 9/11 terrorist attack on the Twin Towers and the Pentagon in 2001.
"The Moon can reach a declination of almost 29 every 18.6 years when the North Node is near 0 Aries. Mercury and Mars achieve a declination of approximately 27 at times. However, in 1907 Mars got out to 28S54'. On rare occasions, Venus will reach 28. Uranus and Pluto go out of bounds less frequently and stay there for longer periods. Saturn and Neptune have nearly the same declination as the Sun while Jupiter only goes a few minutes beyond 2327' and so is rarely ‘out of bounds’. Most out-of-bounds planets are in Gemini or Cancer (Northern declination) or Sagittarius and Capricorn (Southern declination)." — Alice Portman.
More on Out of Bounds Moon from Steven Forrest (offsite).
Go to Top Out of Sign
A dissociate aspect; one which, though within orb, is not within the bounds of the aspecting sign. For example, an out-of-sign (dissociate) conjunction of Mars and Venus, when Mars is in 28° Libra and Venus is in 2° Scorpio is much weaker than if Mars were at 7° Scorpio, even though the orb of aspect would still be 5°. Similarly, an out-of-sign (dissociate) square between Sun at 3° Aries and Saturn at 29° Gemini, is much less significant than an in-sign square with Saturn at 7° Cancer.
Go to Top Outer Planets
Uranus, Neptune and Pluto. These planets, the furthest out in our Solar System, are invisible to the naked eye and so were only discovered in modern times, thanks to the invention of the telescope. They usually affect us at a very deep, subliminal level and the unconscious, generational effects are only brought to the surface when aspected by the Luminaries or other visible planets. Modern astrologers have incorporated them into astrological practice, but they are not generally considered by traditional astrologers, as they do not fit the classical symbolic structure of astrology.
[NOTE: Distant bodies in our solar system such as Chiron are not usually classed as Outer Planets, or even true planets (Chiron now seems more like a comet). Pluto has even recently been demoted by the IAU to the status of a "dwarf planet", but this does not diminish his astrological value. Other bodies such as Eris, a recently-discovered "dwarf planet" in the Kuiper Belt, are known to exist by science, but as yet have no accepted astrological significance.]
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This page was last modified on Thursday, 13 February 2020