The Greeks assigned their seven vowel sounds, one to each planet, for they believed that the musical notes the planets each sang in their orbits were the mystical vowel sounds forever singing the name of God: First Planet: Moon Α (Alpha) Second Planet: Mercury Ε (Epsilon) Third Planet: Venus Η (Eta) Long E Fourth Planet: Sun Ι (Iota) Fifth Planet: Mars Ο (Omicron) Short O Sixth Planet: Jupiter Υ (Upsilon) Seventh Planet: Saturn Ο (Omega) Long O