The ring finger and the mound just below it are ruled by the Sun, commonly referred to as Apollo.
Astrologically the Sun is the ruler of the zodiac sign Leo and is at home in the 5th house of the wheel. The Sun's element is Fire.
Mythology
Apollo was the offspring of Zeus and Leto and the twin brother of Artemis, Goddess of the Moon. Apollo was nursed on nectar and ambrosia and became a mighty God who claimed the lyre and the curved bow to be his. He wore the crown of laurel and his lyre was made of ivory and studded with gems. Apollo was the epitome of male beauty. He was said to have been the creator of music and poetry and he defeated any who dared to compete with him in these arenas.
Apollo's temple was at Delphi, home of the famous oracle. Inscribed there are the words, "Know Thyself".
Astrological Meaning
The Sun is heat and its light is required for all forms of creation in the world. The Sun in the natal chart represents the self. Its keywords are essence, radiance, source, identity, expressiveness, play, creativity, confidence, motivation, and self-realization.
Its positive manifestation is the healthy development of one's own individuality, warmth, creativity and self-confidence. Negatively it may be expressed as narcissism and arrogance, or a weak will and lack of confidence.
Apollo (The Sun) in your Hand
Apollo in the hand reveals the subject's feelings about expression of the self. Keywords include creativity, aesthetics, art, beauty, the persona, personal expression, niche, social skills, applause.
The size and shape of the lower zone of the Apollo finger shows whether the subject feels acceptance in the world. A star on the mound of Apollo is an indication of exceptional creative talents.