The Accuracy of the predictive astrology does not depend only on the placement of the planets in a particular sign rather the angular aspects of the planets on each other make a great difference to the interpretation on the whole. .

As per India Astrology, All the planets aspects  the 7th house from its position(180 deg). Jupiter Rahu and Ketu are capable of additional aspect of  5th and 9th (120 deg) from its position. Mars has additional aspect aspect of 4th and  8th from its position.Saturn has additional aspect of 3rd and 10th from its position.

While Analyzing a horoscope we take into consideration only the aspect of 180 degree of all planets i.e aspect on the 7th house from the planet positioned.

Tajaka Theory is the theory of Aspects (Drishti) normally applied in Horary Astrology(Prasna Tantra)

The aspects considered as per Tajaka theory are

Trine: When 2 planets are 120 degree from each other i.e. in the 5th house and 9th house from each other. This aspect is 75% strong. This aspect is considered to be the strongest and most benefic of all aspects and denotes fulfilment.

Sextile: When the 2 planets are 3rd and 11 from each other it is known as Sextile aspect. In this the planets are 60  degree apart from each other. The aspect on 3rd is 40% strong and the aspect on 11th is 10% strong. This aspect is also considered as a favorable aspect denoting fulfilment.

Square: When the 2 planets are placed 4th and 10th from each other it is known as Square aspect. In this aspect the planets are placed 60 degree from each other. It is considered to be 45% strong. but this aspect is inimical aspect always indicating difficulties, obstruction etc.

Opposition: When the 2 planets are placed 7th from each other is is known as opposition aspect. In this the 2 planets are placed 180 degree from each other. This aspect is 100% strong  and always give rise to unfavorable and adverse results

In understanding the results of the Tajaka aspects The writers of Tajaka did not took in account the strength and nature of the planets. This can be taken as the limitation of the tajaka aspect because if the 2 planets are Mars and Saturn then the results will be much different from the results when the 2 planets are Jupiter and Venus.

Parashary Aspects are based on the natal chart whereas Tajik aspects are based on Horary Astrology.