The Sun (☉) is the central celestial body of our solar system, the source of light, heat, and life for Earth. In alchemy, the Sun is the direct symbol of gold, the perfect, incorruptible metal, and the goal of the Great Work. The Latin word for gold, aurum, is derived from aurora (dawn), linking it to the Sun's daily rebirth.

Position on the Tree of Life

On the Tree of Life, the Sun corresponds to the sixth Sephirah, Tiphereth (Beauty). This position places it at the heart of the Tree, balancing the severity of Geburah (Mars) with the mercy of Chesed (Jupiter). Tiphereth is the sphere of the Son, the sacrificed god, and the solar hero, representing the fully realized self and the point of harmony between the macrocosm and microcosm.

Astrological and planetary correspondence

Astrologically, the Sun is the ruler of the zodiac sign Leo (♌). It represents the core identity, the will, vitality, and the conscious self. In the planetary hierarchy of the Tree, the Sun holds a central, mediating role, receiving the influences from the supernal triad and transmitting them down to the lower spheres.

Historical context

The identification of the Sun with gold is the most fundamental equation in alchemy. This is not a mere metaphor; the alchemist believed that the Sun's celestial rays, through a process of astral influence, seeded the earth with a metallic principle that matured into gold over vast ages. The alchemical Sun is therefore both the celestial body and its terrestrial child, gold. The Tabula Smaragdina (Emerald Tablet) states, "The Sun is its father, the Moon its mother," establishing the Sun as the active, formative principle in the creation of the Philosopher's Stone. In the Rosarium Philosophorum and other medieval texts, the Sun is often depicted as a king (Rex) who must be dissolved and purified to be reborn. The alchemical process of solutio and coagulatio mirrors the Sun's daily setting and rising. The metal gold itself, being incorruptible and unchanging, was seen as the earthly manifestation of the Sun's eternal, divine light. The Aurum Potabile (drinkable gold) was a legendary elixir of life, a liquid form of the Sun's essence.

In the table of Liber 777, the Sun (☉) appears at scale step 5 (Geburah) within the column of Alchemical Metals (ii.), signifying its role as the perfected, fiery essence of the metal kingdom, a substance of power and transformation, not merely of passive beauty.