Science / Astrology / 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 in modern times, is called primary directions (progressions) to distinguish it from secondary progressions, the 'day for a year' system of progressing a natal horoscope.
Science / Tides and Currents / Equatorial Undercurrent: A subsurface current setting eastward along the Equator in the Pacific, Atlantic, and Indian Oceans. In the Pacific, its core of maximum velocity lies at a depth of about 100 meters within the South E MORE
Science / Tides and Currents / North Equatorial Current: A current setting west-ward in the North Atlantic and North Pacific Oceans and in the Indian Ocean from about October to July. It occurs immediately north of the Equatorial Counter Current. MORE