Sidereal Astrology

Tropical and Sidereal Zodiac


The Zodiac is a circular band extending approximately 9 on either side of the ecliptic , so a band of 18. The word derives from the Greek zoon, meaning animal. In ancient times the zodiac was known as the "circle of animals" in reference to the names of animals that designate constellations.
The Sidereal Zodiac puts the starting point (0 Aries) fixed with respect to the background stars.
The Tropical Zodiac puts the starting point (0 Aries) at the Vernal Equinox , which due to the precession of the equinoxes is moving 1 every 72 years against the background of stars.


Video: what's nutation , precession

The exact number of degrees of displacement between the Tropical and Sidereal Zodiac (called Ayanamsha) is different depending on the school of Sidereal Astrology:
From approximately, a planet located at 0 Aries for school Fagan Bradley appears on 1 Aries in schools Lahiri and Krishnamurti, and on 5 Aries in Sassanian and Hipparchos. Currently displacement between Tropical and Sidereal Zodiac Fagan Bradley is about 24 (and increased by 1 every 72 years.)

The only difference you will see in your reports with Sidereal Zodiac is that most of the planets are in the zodiacal sign before the Tropical zodiac sign. Aspects between planets and the positions of planets in the houses do not vary.

Currently tropical zodiac signs do not match the fixed star constellations bearing the same name. Furthermore there is an important difference: the signs are geometric sections of equal size, each comprising 30 in correspondence with a period of approximately one month, the constellations have more irregular shapes and sometimes overlap.
Figure 2
If we go to a astronomical observatory one March 21 and ask astronomers where the Sun is, undoubtedly they will said it's in the fixed stars constellation of Pisces, although in the Tropical zodiac will appear in the sign of Aries.

To the ancient civilizations that used astrology over 3000 years ago, the beginning of spring (vernal equinox) marked the beginning of the year, as it was the moment that life was returning to sprout in the ground, so the beginning or Zodiac zero-point on the ecliptic was established using the vernal equinox , a day during which the day and night are of equal length worldwide. (The word "equinox" comes from Latin Aequinoctium, which means 'equal night' and vernal means 'spring').
From that point on the ecliptic Vernal divided into segments of 30 to delimit the 12 signs of the Zodiac. This way of defining the zodiac is called Tropical Zodiac, also called "seasonal" because it is based on the beginning of the seasons.

Tropical Zodiac Sidereal Zodiac
Puts the 0 Aries at the vernal equinox, is seasonal. Puts the 0 Aries is fixed relative to the background stars.
It moves about 1 every 72 years over the background of stars. Fixed on the background of stars.
There are several schools to define the point 0 Aries (Ayanamsha): Bradley Fagan, Lahiri, Sassanian, Krishnamurti, etc..
Used in almost all western Astrology. Used in oriental Astrology (Hindu or Vedic) and in some schools Hipparchos.

We do not claim that the Sidereal Zodiac is better or worse than the Tropical. Some astrologers believe that young people tend to identify more with the Tropical and going "maturing" (acquiring higher level of consciousness, it has not to do with age) is best suited for the Sidereal. Decide yourself which one suits you best, in the current era of your life based on your own experience.
And if in doubt, do not use any Zodiac at all: while reading your reports use only information on aspects between planets and planets in houses as that information does not change when using a zodiac or another.

The great astrologer Johannes Kepler abandoned the use of the zodiac and based its astrological system only in the aspects between planets. Dane Rudhyar wrote that the zodiac is a product of the capacity of the human psyche to create myths and a remnant of the ancient civilizations that used it to determine and mentally calculate the positions and aspects of planets.

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