This is one of the less discussed topics of Vedic astrology. That is because no one wants the Yogas in his horoscope cancelled by an astrologer. However the discussion is a part of Vedic astrology hence it is taken up. Casting horoscopes with Nakshatra Padas and exact degree of planetary placements is known to all. This becomes necessary to weigh and analyzes the raja yogas present in the horoscope. (Yogas for wealth, power and position etc). Planets in quadrants and trines and lords of quadrants combining or aspecting each other confer Raja yogas. Astrologers over look one fact while looking at these raja yoga combinations is that the mere presence of the raja yoga combination is not sufficient to give the materialization of the yogas.

The first factor is exact degree wise relation i.e. the orb of influence of the planets should meet and the second is the planets causing the yogas should not be in inimical signs, inimical bhavas, or combust with sun. If they are in the inimical signs, bhavas, or combust the raja yogas become defunct.

To cite an example say in a horoscope Aries is the ascendant, with moon exalted in Taurus and Jupiter in Scorpio conjunct with sun forming Gaga kesari yoga of name fame etc with moon. This yoga will not materialize as Jupiter is in the 8th house which is an inimical house and is fully combust.

If Ascendant and the Moon are without aspect from any planet the native with raja yogas even if he is a prince will end up as pauper.

A person born in Vyatipata yoga or at the time of Ketu udaya looses all his raja yogas. If the lords of 9th, 10th and 11th are in debility with malefic yoga and malefic aspect the benefits of raja yogas are nullified.

When in a horoscope the Moon becomes lonely without any planet on either side and no planet in its quadrant also the result is Kemadruma yoga which gives utter poverty. It cancels all raja yogas. There are several types of kemadruma Yogas.

. No planet in either side of Moon
. No planet in any kendra from a lone Moon
. Lone Moon with only Sun in Kendra from Moon
. Moon wit a malefic in the house of a malefic OR Moon in Malefic Navamsa aspected by the 10th lord when birth occurs in the night. (This will be more severe if 10th lord is also a malefic)
. If the 9th lord is laced in the 12th house and 12th lord in the 2nd house with a malefic in 3rdcauses Raja Yoga Bhanga
. Moon in ascendant or in the 7th not aspected by Jupiter is Raja yoga Bhanga
. Equal number of Malefic posted in ascendant and 7thnot aspected by Jupiter Is also Raja Yoga Bhanga.

Fortunately there are rules for cancellation of Kemadruma yogas:
. Lone moon but in a friendly house, or own house, own Navamsa and aspected by Jupiter.
. Lone Moon but in a kendra from ascendant and aspected by Jupiter.
. Presence of Vasumati yoga i.e. all benefics placed in Oopachayas 3, 6,10, 11 from Lagna or Moon cancels Kema druma and Makes the person extremely Wealthy.
. Lalatika Yoga :- Lone Moon in Cancer and8th from it occupied by Sun,Mars, Venus, Saturn
OR
Vice versa Sun, Mars, Venus, Saturn in cancer and lone Moon in 8th from them Results in cancellation of Kemadruma and proficiency in fine arts and very rich.
. Jupiter in a kendra from moon cancels Kemadruma yoga.

Even when Kemadruma yoga is present the following factors reduce the intensity of the yoga:
Moon in 3,6,9,12
Moon in 1,4, 7, 10
Moon in Cancer or Taurus