Precessions since 850,000 B.C

Definition

“Precessions since 850,000 B.C” refers to projecting Earth’s axial precession backward across an immense span of time. Precession is the slow change in the direction of Earth’s rotational axis, which gradually shifts the equinoxes relative to the background stars. One full cycle is commonly estimated at about 25,700–26,000 years, although its rate is not perfectly constant over geological timescales.

Astrological Meaning

In astrology, precession helps explain the difference between tropical and sidereal zodiacs. The tropical zodiac anchors its signs to the seasonal equinoxes and solstices, while sidereal systems relate zodiacal positions to stellar reference points and apply an ayanamsha, or precessional offset. Extremely ancient projections may also appear in discussions of astrological ages or hypothetical long-term cycles. Such timelines are interpretive reconstructions rather than preserved astrological records, and calculations become increasingly model-dependent when extended hundreds of thousands of years into the past.

Why It Matters

Understanding this phrase prevents astronomical precession from being confused with ordinary planetary transits or changes within an individual natal chart. It also provides context for debates about zodiac reference systems and the dating of astrological ages. Claims tied to 850,000 B.C. should be evaluated cautiously, with attention to the astronomical model, chosen reference point, and symbolic assumptions involved.

Related Encyclopedia Entries

• Precession of the Equinoxes
• Tropical Zodiac
• Sidereal Zodiac
• Ayanamsha
• Astrological Ages
• Natal Chart