Zodiac: The zone extending on both sides of the ecliptic, with a total width of about 16 degrees, so as to include the paths of the planets and moon. It is divided into twelve equal parts or signs, which are counted from the position of the vernal equinoctial point. The position of this point recedes westward along the ecliptic at the rate of about 50" of arc per year. The Hindus call this the fixed zodiac, giving the name of movable zodiac to the zodiacal constellations. The ancient figure for the length of a precessional cycle is 25,920 years, also the length of an important racial unit in human evolution.

Time is marked by the passage of the planets through its signs, by their conjunctions in various positions, and by the movement of the nodes and apsides of planets; so that the whole course of cycles large and small can be calculated and the past and future read by those who understand. The twelve divisions of the ecliptic or fixed zodiac have the same names and significance as the zodiacal constellations.