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Monday 10 June 2013

Movable and fixed zodiacs

Movable and fixed zodiacs
The Hindu system of astrology (Visit the Home Page) uses the concept of fixed Zodiac. The western system uses the concept of movable Zodizc.

The earth revolves around the Sun once in 365 days 5 hours 48 minutes and 46 seconds. Considered from the earth, the Sun appears to complete one round of the ecliptic during this period. This is called a tropical year. But Earth is tilted along its axis, 
so in the span of a tropical year, the earth regains its original angular position with the Sun. It is also called the year of seasons since on this Earth-Sun cycle depends the occurrence, and timing, of seasons. If we consider the revolution of the Sun around the earth from one vernal equinox (around 21st March, when the day and night all over the globe are equal) to the next vernal equinox, it takes one tropical year to do so.
 On the other hand However, if at the end of a tropical year from one vernal equinox to the next, we consider the position of the earth with reference to a fixed star of the zodiac (The Ayanamsa is based on the position of the constant Chitra Nakshtra), the earth appears to lie some 50.26 seconds of celestial longitude to the west of its original position. In order for the earth to attain the same position with respect to a fixed star after one revolution, it takes a time span of 365 days 6 hours 9 minutes and some 9.5 seconds. This duration of time is called a sidereal year .The sidereal year is just over 20 minutes longer than the tropical year; this time difference is equivalent to 50.26 seconds of celestial longitude.

The "Ayanamsa" is the distance or the difference at present moment of time between the fixed and movable Zodiac. We can say The angular difference between the vernal equinox and the Vedic starting point of the zodiac is known as the Ayanamsa. When the Vedic starting point is w.r.t Chitra Nakshtra, the Ayanamsa is refered to as the Chitrapaksha Ayanamsa.

From the Hindu ayana, the arc that describes the increasing gap between the tropical and sidereal zodiacs. The ayanamsa, which changes continually at the rate of approximately 50" a year.
The Hindu system of astrology is known as Nirayana System because

The Niryana and the Sayana zodiacs coincided in the year 285 AD when the ayanamsa was zero. At the rate of precession of equinoxes 50.26 seconds per year, the ayanamsa today is 24°03'58".

The equinoctial precession completes one round in approximately 26,000 years, as mentioned earlier, so that the fixed and movable zodiacs coincide regularly after this time span.


#Ayanamsa, #Fixed_and_movable_zodiac, #Ayanamsha, #Precession

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