The astrological symbol of the Moon takes the form of a crescent, generally ☽ in Western charts. Unlike the Sun, represented by a centered circle, the Moon is depicted by an open curve that directly recalls its visible phases. In antiquity, it was associated with Selene among the Greeks and Luna among the Romans. In traditional astrology, it represents change, the body, growth, fertility, rhythms, the nocturnal world, and that which receives and then reflects light. In alchemy, the lunar crescent denotes silver.
| Glyph | ☽ or ☾ depending on graphic traditions |
|---|---|
| Astrological nature | Luminary, not a planet in the astronomical sense |
| Ancient deities | Selene / Luna |
| Traditional astrology | Body, rhythms, growth, fertility, change, night |
| Alchemy | Silver |
Why does the glyph reproduce a lunar phase?
The Moon is the celestial body whose transformations are visible to the naked eye over a short cycle. The crescent is therefore an almost immediate representation of its appearance.
Unicode encodes two crescents, ☽ and ☾, in the series of astrological symbols and also indicates their alchemical use for silver. Western ephemerides and astrological charts generally favor a crescent facing left.
The shape does not require a hidden explanation: it derives directly from observing a lunar phase. It is one of the most figurative planetary glyphs.
What is the connection with Selene and Luna?
Selene personifies the Moon in Greek tradition and Luna in Roman tradition. As with the other classical celestial bodies, astrology and mythology developed in a world where the planets were understood through their deities.
The Oxford Research Encyclopedia notes that the astrological Moon is connected to Selene/Luna in the Greco-Roman system. The goddess's stories reinforce themes of night, cycles, and reflected light.
Other lunar deities exist in Mediterranean religions, but they should not all be merged into a single figure. Hellenistic astrology has its own planetary vocabulary.
What does the Moon govern in tradition?
Traditional astrological texts associate the Moon with the body, generation, growth, nourishment, travel, and rapid changes. Its speed through the zodiac makes it particularly connected to the movement of circumstances.
It governs Cancer in the traditional system. Its light varies from night to night, making it a natural indicator of growth, decline, reception, and transmission.
Modern psychological interpretations emphasize emotion, memory, and the need for security. These themes extend certain ancient functions, but they do not sum up the entire lunar tradition.
Why does the Moon correspond to silver?
In the alchemical correspondence of the seven metals and the seven celestial bodies, the Moon corresponds to silver. The metal’s light color and luster encourage this association.
Unicode explicitly indicates that astrological crescents also serve as alchemical symbols for silver. The same sign can therefore move from a horoscope to a metallurgical or alchemical treatise.
The Sun-gold and Moon-silver pairing constitutes one of the major oppositions in the alchemical imagination. It reappears in the Rebis, where the Sun and Moon frame the union of opposing principles.
Why is its change essential to its interpretation?
The Sun maintains a stable circular appearance; the Moon changes shape throughout the month. This visible difference structures much of their astrological contrast.
The Moon receives and reflects sunlight. It thus becomes a principle of reception, adaptation, and transition, while the Sun represents emission and centrality to a greater extent.
The crescent is therefore not merely a pictogram. It visually sums up the idea of a cycle. Read alongside the solar symbol, it forms a fundamental pair in Western astrology.
Sources and historical landmarks
The Unicode standard lists the crescents ☽ and ☾ as astrological symbols and alchemical symbols for silver. NASA identifies the crescent as a historical symbol of the Moon. For the planetary deity, see the Oxford Research Encyclopedia of Planetary Science.
