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A Glossary of Astrological Terms for the letter "J"

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 Johndro
Difficult aspect of 165 degrees, named for early 20th Century astrologer, Lorne Edward Johndro (1882-1951), who wrote extensively on it. Johndro himself was a remarkable astrologer who in concert wth Charles A. Jayne, popularised the concept of the Vertex, which he called the "Electric Ascendant". This 165° aspect is currently enjoying more prominence thanks to Noel Tyl, who calls it the quindecile (usually reserved for the 24° aspect). See Quindecile.
Go to Top Marc Edmund Jones
Marc Edmund Jones (1888-1980) used the history of astrology and theosophical theories to justify a "reform" of astrology. His philosophical and doctrinal guidelines, derived from Idealist philosophy and the Theosophy of H P Blavatsky, established a foundation for a psychological astrology. This occurred in his lifetime as seen in the teachings of Dane Rudhyar (1895-1985) and others, whose debt to him is extensive, whether or not it is consciously recognised. In Jones's opinion, astrology is not about prediction but about the process of temporal manifestation of potentials latent in Mind in any given time and place. His vision of astrology and biases against prediction became pervasive in American popular astrology of the 1960's onwards and thoroughly penetrated the literature and doctrines of contemporary American astrology. Despite his professed opposition to prediction, Jones was a practising horary astrologer, casting horoscopes to answer precise questions, and made predictions from the natal horoscope. More on Marc Edmund Jones (offsite).
Go to Top Joys
Places in the zodiac where planets rejoice, being harmoniously located, having the most beneficial effect. According to William Lilly, the joys of the planets are:
  • Saturn: joy in Aquarius
  • Jupiter: joy in Sagittarius
  • Mars: joy in Scorpio
  • Sun: joy in Leo
  • Venus: joy in Taurus
  • Mercury: joy in Virgo
  • Moon: joy in Cancer
Lilly proposed certain Houses as joys for the planets too. For example Saturn rejoices in the First House, because "he is the first among the planets" (according to the Chaldean Order). Hellenic Astrology featured a different, House-based system, now recognised due to recent translations of ancient works. Lilly thus disagrees with Ibn-Ezra, the 11th Century astrologer, who holds that Saturn joys in the 12th house, partly because he cannot "see" the ascendant and is square the Sun, his sect lord, and opposed to Mars, his contrary sect partner. Although Joy is rarely used in modern astrology, here is Avraham Ibn-Ezra's assignment of joys in the Houses:
  • Saturn: joy in 12th
  • Jupiter: joy in 11th
  • Mars: joy in 6th
  • Sun: joy in 9th
  • Venus: joy in 5th
  • Mercury: joy in 1st
  • Moon: joy in 3rd
Go to Top Judicial Astrology
The judgement of events yet to come by means of consulting the planetary positions and other horoscopic factors.
  1. In the form known as Mundane Astrology, it relates to the forecasting of principal events which will befall a country and public conditions which will prevail.
  2. Electional Astrology is the judgement of an appropriate time to choose for the success of a venture (such as a battle, a wedding, a journey, laying the foundation stone of a building, etc.), using astrological techniques.
  3. Horary Astrology seeks the answer to a question, using the chart of the moment the question arises.
  4. Natal or Genethliacal Astrology judges the character and destiny of an individual based on the astrological factors at work at the moment of the first breath.
Judicial Astrology is (or was) distinguished from Natural Astrology.
Go to Top Julian Calendar
In ancient times the Roman Calendar had fallen into disarray and had become almost unusable for the purposes of the Roman Empire. In 46 BC, Julius Caesar gave Sosigenes of Alexandria the task of designing an easy-to-use and exact calendar. Sosigenes assumed that the year had a length of 365¼ days and worked out the leap year rule, by which three common years should be followed by one leap year, the former having 365 days each, while the latter should have 366 days. The months were no longer determined by the Moon's phases and were given lengths of 30 or 31 days, excepting February, which was given 28 days in common years and 29 in a leap year.
Go to Top Julian Day
The Julian day number can be considered a very simple calendar, where its calendar date is just an integer. This is useful for reference, computations, and conversions. It allows the time between any two dates in history to be computed by simple subtraction. It is based on the Julian Proleptic Calendar which has been designated to have begun on January 1st, 4713 BC, at Greenwich Noon.
Go to Top Juno
The queen of the gods; wife of Jupiter. An asteroid seen by some modern astrologers as significant. She rules wifely relationships; the role of woman as covenanter and partner; contracts and binding agreements. More about Asteroids.
Go to Top Jupiter
The king of the gods, a planet symbolising matters to do with the law, religion, authority, expansion, fortune, the higher mind and so on. Ruler of Sagittarius and Pisces. Exalted in Cancer. The greater benefic. Mythological brother of Neptune and Pluto, son of Saturn. More about Jupiter.
Go to Top Jupiter Pluvius
The aspect of Jupiter as the bringer of rain.
Go to Top Jyotish
Indian (Vedic) astrology. This system is based on the sidereal zodiac, as opposed to the tropical zodiac favoured by most contemporary Western Astrologers. See Vedic Astrology.
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This page was last modified on Thursday, 13 February 2020