Sidereal vs Western Astrology

#Vedic vs #Western

Many people keep wondering that why their sign placements change when they go from western to vedic...

First Note the following

Vedic Astrology is based on #sidereal zodiac, and Western Astrology is based on #tropical zodiac.

** In tropical zodiac (used in western), we start marking signs on the zodiac from the vernal-equinox point. So in western tropical system, the 0° Aries will always coincide with the Vernal-Equinox point. VE however is not a fixed point. VE is slowly moving backwards approximately @ 1° per 72 years. This happens because of the precession of the earth's axis. So in 72 years from now, what you call 29° Pisces in western astrology today, will become the 0° Aries as per Western

Let is call the western tropical 0° Aries point that is located at VE point as WTO (western tropical origin point) on the zodiac.

** In sidereal zodiac (used in vedic), we start marking signs on the zodiac with reference to a very very distant fixed star that is part of many stars which form the background of our zodiac. 

So in vedic sidereal system, the 0° Aries is a fixed point identified with reference to a fixed star. 

Let is call the vedic sidereal 0° Aries point that is a fixed point on the zodiac as VSO (vedic sidereal origin point) on the zodiac

** At one time (nearly 2000 years ago) the WTO coincided with the VSO. 

But as the VE (vernal equinox) point is moving backwards approximately @ 1 deg per 72 years, so obviously WTO point too is shifting backwards, and a gap is being created between the WTO and VSO points.

At anytime the gap between WTO point and VSO point is called #Ayanamsha.

Today, in June, 2020 AD.. the Ayanamsha is 24° 28' 30".

So it means what you call 24° 28' 30" Aries today as per the tropical western, that same point is 0 deg Aries as per Vedic Sidereal.

Remember the formula

If

VC = vedic coordinate of a planet at a time t

WC = westeren coordinate of a planet at the time t

A = ayanamsha at the same time t

Then

VC = WC – A

WC = VC + A

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Any planet which is at less than 24° in any sign as per tropical western... will go into the preceding sign in sidereal vedic

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#NOTE – 

please note when you shift from western to vedic and vice-versa, you only change the coordinates (that describes the positions of planets). 

This does not affect the kind of motions of the planets. If a planet is retrograde, he will be retrograde in both Vedic and Western. 

If two planets are seperated by, say 120 deg, their seperation will be 120 deg in both Vedic and Western.... and so on.