For ancient sky-watchers there were seven bodies that moved against the background of the fixed stars: the Moon, Mercury, Venus, the Sun, Mars, Jupiter and Saturn. The word "planet" comes from the Greek planētēs, "wanderer". The Sun and Moon, which modern astronomy classifies differently, were planets in their own right because they too wandered along the zodiac. The whole structure of traditional astrology, from Mesopotamia to the Hellenistic world, from the Arabic tradition to the European Renaissance, was built on these seven bodies.
The Chaldean order and the spheres
Tradition arranges the planets by their apparent speed, from slowest to fastest: Saturn, Jupiter, Mars, Sun, Venus, Mercury, Moon. This is known as the Chaldean order. In ancient and medieval cosmology each planet occupied a concentric sphere around the Earth, and the soul, descending towards birth or rising again after death, passed through these spheres, receiving or returning their qualities. This picture is not an astronomical fact but a symbolic map: it describes inner life as a graded journey, from the densest to the subtlest.
Luminaries, benefics and malefics
Tradition groups the seven planets into a few families that are useful for interpretation:
- The luminaries: the Sun and Moon, the two sources of light, representing the vital and the receptive principle, consciousness and body, day and night.
- The benefics: Jupiter (the greater benefic) and Venus (the lesser benefic), associated with growth, harmony, pleasure and measure.
- The malefics: Saturn (the greater malefic) and Mars (the lesser malefic), associated with limits, separation, conflict and cutting.
- Mercury, neutral and changeable, which takes on the nature of the planets it relates to.
It is important to understand that "malefic" does not mean "evil" in a moral sense. Saturn teaches patience and structure, Mars courage and the ability to defend oneself. The ancient language pointed rather to a quality that is hard to handle and calls for awareness.
The natures of the seven planets
Saturn
Cold and dry, slow, linked to time, old age, memory and discipline. Symbolically it stands for the boundary, what gives form and what takes away. In mythology it is Cronus, the god of time who devours and ripens.
Jupiter
Warm and moist, temperate, associated with law, generosity, faith and wisdom. It is the principle that expands and gives meaning, the judge and the teacher.
Mars
Excessively hot and dry, linked to iron, fire, will, action and struggle. As a symbol it is the force that separates and cuts, as necessary as it is dangerous.
The Sun
Hot and dry yet life-giving, it is the king of the sky, the heart, identity, dignity and the light of consciousness. Many traditions place it at the centre of the Chaldean order, as a mediator between the superior and the inferior planets.
Venus
Moderately cold and moist, it is the principle of attraction, beauty, bonds and pleasure. Morning and evening star, it is the very symbol of harmony between opposites.
Mercury
Variable, linked to speech, trade, study, short journeys and wit. It is the messenger, the one who connects and translates.
The Moon
Cold and moist, the closest and the fastest. It rules the body, the humours, nourishment, family memory and the rhythm of changing time. It gathers the light of the other planets and passes it on to the Earth.
Traditional correspondences
Each planet has a web of correspondences that served physicians, alchemists and artists for centuries. Here are the main ones:
| Planet | Metal | Day | Symbolic colour |
|---|---|---|---|
| Saturn | Lead | Saturday | Black, dark grey |
| Jupiter | Tin | Thursday | Blue, purple |
| Mars | Iron | Tuesday | Red |
| Sun | Gold | Sunday | Gold, yellow |
| Venus | Copper | Friday | Green |
| Mercury | Mercury (quicksilver) | Wednesday | Mixed colours |
| Moon | Silver | Monday | White, silver |
Colours vary between authors, while metals and days are among the most stable correspondences in the tradition.
What about the modern planets?
Uranus, Neptune and Pluto were discovered with the telescope, between the late eighteenth and the twentieth century, and are not part of the traditional system. Many contemporary astrologers use them; those who follow the classical approach prefer to work with the seven alone, because dignities, planetary hours, the days of the week and the entire language of correspondences rest on them. At Studio Esoterico Cornelio this reading is preferred, because it preserves the internal coherence of the ancient system.
How to use this symbolism today
Knowing the seven planets does not mean expecting mechanical predictions. It means having seven keys for reading experience: when the need for structure prevails, you are speaking Saturn's language; when you seek beauty and relationship, Venus's. A simple exercise is to dedicate each day of the week to a reflection on its planet, noticing how that quality shows up in your own life.
In short
- The seven traditional planets are the Moon, Mercury, Venus, the Sun, Mars, Jupiter and Saturn, the "wandering" bodies visible to the naked eye.
- The Chaldean order arranges them from slowest to fastest and underlies many other correspondences.
- Benefics and malefics indicate easy or difficult qualities, not moral judgements.
- Metals, days and colours form a coherent symbolic system used for centuries.
- Studying the planets is a language for self-understanding, not a tool for certain prediction.