Also called Phoebus (the pure, shining); son of Zeus and Leto (Latona), the polar region or night, and twin brother of Artemis (Diana). His birth shows the emanation of light from darkness. One of the most popular gods of Greek mythology, he is primarily the god of light, and is also associated with the sun, hence a giver of life, light, and wisdom to the earth and humanity. Apollo and Artemis are the mystic sun and the higher occult moon (SD 2:771). Apollo stands for order, justice, law, and purification by penance. His attribute as a punisher of evil is shown by his bow, with which as an infant he slew Python. He is the deity who wards off evil; the healer, father of Aesculapius and often identified with him; and the god of divination, associated especially with the Oracle at Delphi. The other principal seat of his worship was at Delos, his birthplace. He was also the patron of song and music, of new civic foundations, and protector of crops and flocks. His lyre is the sacred heptachord or septenary, seen in the sevenfold manifestations of the Logos in the universe and man; he is also the sun with its seven planets. He answers in some respects to the Hindu Indra and Karttikeya and in others to the Christian archangel Michael; Janus was the Roman god of light.
(source : "Encyclopedic Theosophical Glossary", traduction d'Esopedia)