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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Difficult aspect of 165 degrees, named for 19th Century astrologer, Edward L. Johndro, who wrote extensively on it. Currently enjoying more prominence thanks to Noel Tyl, who calls it the quindecile (usually reserved for the 24° aspect). See Quindecile.


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. Rarely used in modern astrology.

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.

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.

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.


The queen of the gods; wife of Jupiter. An asteroid seen by modern astrologers as significant. She rules wifely relationships; the role of woman as covenanter and partner; contracts and binding agreements. More about Asteroids.


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.

Jupiter Pluvius

The aspect of Jupiter as the bringer of rain.


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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