The Sun is yin, the Moon is yang. The Sun is the father, The Moon, the mother. The Sun is intuitive knowledge, the Moon reasoned one. The Sun is gold and the Moon silver, the Sun is soul and the Moon body. Together they represent the essence of form and matter.
Earth and skies, moist and dry, north and south, darkness and light, day and night: masculine and feminine energies working in tandem. Together they are invincible.