Home > Lifestyle and Dating > Horoscopes > Glossary of Astrology Terms > Glossary (E) > Equatorial Arcs



Equatorial Arcs

A method of progressing house cusps, based upon the Earth's rotation, in which one year of life corresponds to the passage of 1° right ascension over the meridian, approximately four minutes of time. This method, little used now, is called primary directions (progressions) to distinguish it from secondary progressions, the "day for a year" system of progressing a natal horoscope.