If anything concrete is driving astrological phenomena, it is the actual, physical zodiac star sign constellations along the ecliptic.
Inventions""s Technical Means and Determinations on Astrological Coordinate Systems, Zodiac Positions, Precession and Precision
The xe2x80x9ctropical yearxe2x80x9d is measured as the length from equinox to equinox, 365.24 days, marking the complete annual cycle of the seasons and underlying the Gregorian civil calendar. The synodic month, 29.5 days, marks the cycle through the lunar phases. At the vernal equinox, the Sun crosses north over the equator. Time, specifically, the duration of a second, is the most accurately measured unit known, though many of its properties are unknown.
The principal time standard in astrological use today is Greenwich Mean Time (GMT), established 1884 as the world""s official time. The meridian through the Greenwich Observatorywas designated as the prime meridian. Astronomical measurements were used to mark GMT local time; other time zones added or subtracted a related number of hours. Astronomical and astrological ephemerides, data and artifacts were, and still are, honed to GMT specifications. Modern time-keepers, however, no longer use astronomical time.
Instead, the current official world time standard derives off of International Atomic Time (TAI), and is termed, Coordinated Universal Time (UTC), this being based off multiple coordinated atomic clocks located around the globe and in space. A single blended, refined value originates from a scientific center near Paris. Universal Time is used in astrological and astronomical data, usually having the Greenwich meridian. Variants of UT exist, as do Greenwich and Local Sidereal Time, plus another format called Ephemeris Time.
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