Envision that astrology is made up of the study of all of the planets and the sun. The astrological birth chart and the study of how planetary alignments affect sun signs are based on these aspects of astrology. The moon actually influences this overall picture, and can cause certain aspects of astrological phenomena to influence our lives differently than was otherwise predicted.

The Farmer's Almanac defines a blue moon as the third full moon in a season of four full moons. This is the correct definition of a blue moon. Since a season is three months long, most seasons will have three full moons. However, on occasion a season will have four. When this happens, the third is a true blue moon.

The most widely accepted scenario, explaining our Moon's mysterious and ancient birth, is termed the Giant Impact Theory. According to this theory, Earth's Moon was born as the result of a gigantic collision between our still-forming planet and a primordial Mars-sized protoplanet that has been named Theia. The tragedy that was the doomed Theia probably had an orbit that crossed Earth's--making such a catastrophic collision difficult to avoid. It is thought that the impacting Theia hit our planet hard, but swiped it with a glancing blow at precisely the right angle. In fact, Theia came very close to bouncing off Earth, but was swallowed instead. The blast dispatched shock waves across our ancient planet, hurling debris and gas screaming into space. For a short time, Earth had a ring around it that was composed of this ejected material.