What is Jupiter in Western astrology?

Definition

Jupiter is the fifth planet from the Sun and the largest in the Solar System, a gas giant whose mass is nearly 2.5 times that of all the other planets combined, and in Western astrology one of the seven classical planets, described by Ptolemy's Tetrabiblos as temperate, heating, and humidifying.

In plain words

In the Tetrabiblos, Ptolemy describes Jupiter as temperate, warm, and moist, placed between the cooling influence of Saturn and the burning power of Mars. Astronomers separately describe Jupiter as the fifth planet from the Sun and the largest in the Solar System.

Also asked as

• What does Jupiter represent in Western astrology?
• Which signs does Jupiter rule?
• How long is Jupiter's orbit and synodic cycle?
• How often is Jupiter retrograde?

History

Ptolemy reports that the ancients counted Jupiter among the beneficent planets, together with Venus and the moon, because of its tempered nature and its abundance of the hot and the moist. He also classes Jupiter as masculine and as diurnal.¹

Jupiter is not directly named in the Britannica astrology article, which discusses the planets only in general terms within astrology's history.²

Jupiter was named after the chief god of the divine pantheon in both ancient Greek and Roman civilizations: Zeus to the Greeks and Jupiter to the Romans. The International Astronomical Union formally adopted the name Jupiter for the planet in 1976.³

Quick timeline

1. Early record — Ptolemy reports that the ancients counted Jupiter among the beneficent planets, together with Venus and the moon, because of its tempered nature and its abundance of the hot and the moist. He also classes Jupiter as masculine and as diurnal.¹
2. Classical framework — Jupiter is not directly named in the Britannica astrology article, which discusses the planets only in general terms within astrology's history.²
3. Later transmission — Jupiter was named after the chief god of the divine pantheon in both ancient Greek and Roman civilizations: Zeus to the Greeks and Jupiter to the Romans. The International Astronomical Union formally adopted the name Jupiter for the planet in 1976.³
4. Modern usage — In Ptolemy's Tetrabiblos, Jupiter is described as having a temperate active force, because its movement lies between the cooling influence of Saturn and the burning power of Mars. Jupiter both heats and humidifies, and because its heating power is greater due to the underlying spheres, it produces fertilizing winds.¹

What classical and modern sources say

Classical view

In Ptolemy's Tetrabiblos, Jupiter is described as having a temperate active force, because its movement lies between the cooling influence of Saturn and the burning power of Mars. Jupiter both heats and humidifies, and because its heating power is greater due to the underlying spheres, it produces fertilizing winds.¹

The seven classical planets are those easily seen with the naked eye, and they were known to ancient astrologers; in order of speed they are the Moon, Mercury, Venus, Sun, Mars, Jupiter, and Saturn.⁴

Modern view

Olcott notes that Jupiter, though it appears to move slowly, really travels at the incomprehensible rate of five hundred miles a minute. Modern readers can treat this as a useful starting point for curiosity about the planet's real motion. Astronomers separately describe Jupiter as the fifth planet from the Sun and the largest in the Solar System, with clouds that travel in alternating eastward and westward belts. Keeping measured motion apart from astrological meaning lets a first-time reader explore both with clarity and an open mind.⁶

Rulership, cycles and traditional nature

Traditional rulership

Ptolemy's Tetrabiblos assigns Jupiter the signs Sagittarius and Pisces, which it describes as windy and fecund and in triangular aspect to the luminaries. Cancer is its exaltation, where it reaches farthest north, and Capricorn is its depression. These are symbolic table relationships in the classical system, not claims of physical control over anything.¹

Sect and nature

In Ptolemy's scheme Jupiter is assigned to the day sect and described as warm and moist, and it is classed as masculine and diurnal. The ancients counted it among the beneficent planets together with Venus and the moon. These are historical symbolic classifications used to group the classical planets into day and night sects.¹

Names and symbol

Jupiter was named after the chief god of the divine pantheon in both ancient Greek and Roman civilizations, Zeus to the Greeks and Jupiter to the Romans, and its planetary symbol descends from a Greek zeta with a horizontal stroke, used as an abbreviation for Zeus. The table associates Jupiter with Marduk as well and gives its European meaning as leader, king and father of the Olympian gods.³⁵

Orbital cycle

Jupiter orbits the Sun at a distance of 5.20 AU, with an orbital period of 11.86 years. These measured cycles remain separate from astrological interpretation.³⁵

The astronomy

Jupiter is the fifth planet from the Sun and the largest in the Solar System. It is a gas giant whose mass is nearly 2.5 times that of all the other planets combined, according to Wikipedia's Jupiter entry.³

Jupiter orbits the Sun at a distance of 5.20 AU, with an orbital period of 11.86 years. Its sidereal orbital period is listed as 4,332.59 days in the same Wikipedia entry.³

NASA's Photojournal describes Jupiter's cloud system: zones of light-colored, ascending clouds alternate with bands of dark, descending clouds.³⁶

Where astrologers differ

Ptolemy notes that Jupiter and Venus share a tempered nature, but Venus acts in the opposite way, warming moderately and chiefly humidifying like the moon. Ptolemy also says Jupiter's heating is the greater of its two powers. In Vedic meaning, Jupiter is described as the mentor and teacher of gods who helped gods in war against demons, and is associated with luck and expansion. Jupiter exceeds in brightness all the planets except Venus, according to William Tyler Olcott in A Field Book of the Stars.

Then and now

Then

In Ptolemy's Tetrabiblos, Jupiter is described as having a temperate active force, because its movement lies between the cooling influence of Saturn and the burning power of Mars. Jupiter both heats and humidifies, and because its heating power is greater due to the underlying spheres, it produces fertilizing winds.¹

Now

Olcott notes that Jupiter, though it appears to move slowly, really travels at the incomprehensible rate of five hundred miles a minute. Modern readers can treat this as a useful starting point for curiosity about the planet's real motion. Astronomers separately describe Jupiter as the fifth planet from the Sun and the largest in the Solar System, with clouds that travel in alternating eastward and westward belts. Keeping measured motion apart from astrological meaning lets a first-time reader explore both with clarity and an open mind.⁶

Worked out from the evidence

Reasoned from the cited facts, not stated outright by any one source.

Because Jupiter is both a classical planet seen with the naked eye and the brightest body after Venus, a first-time reader can see why ancient astrologers placed it among the seven planets they tracked, even though its astrological meaning rests on the Tetrabiblos rather than on its brightness.

Jupiter's measured orbit of about 11.86 years and its roughly one-constellation-per-year drift through the Zodiac together explain why astrologers can describe it as a slow, long-cycle planet, a pattern that neither source states as a single claim.

Not yet confirmed

Follow the parts of Jupiter

Continue through Mars, Saturn.

Questions people also ask

What does Jupiter represent in Western astrology?

In Ptolemy's Tetrabiblos, Jupiter is described as temperate, heating and humidifying, and placed between the cooling influence of Saturn and the burning power of Mars.¹⁵

Which signs does Jupiter rule?

According to Ptolemy's Tetrabiblos, Jupiter is assigned Sagittarius and Pisces, with Cancer as its exaltation and Capricorn as its depression. These are symbolic table relationships in the classical system, not claims of physical control over anything.¹

How long is Jupiter's orbit and synodic cycle?

These measured cycles are kept separate from astrological interpretation.¹⁵

Method and review

Every statement about Jupiter was checked against the wording of its 6 sources (Ptolemy (LacusCurtius), Encyclopaedia Britannica, Wikipedia and Wikisource), and its positions and boundaries were calculated with Astronomy Engine. How the Machine works.