We find that some of the astrological predictions go wrong. Astrology is a science. It is a science based on astronomy. While making predictions, a lot of factors are to be taken into account with regard to each planet. In the first place the exact time of birth is to be ascertained. In most of the horoscopes, we can notice the time of birth rounded off to five minutes, for example 09.05 or 9.10 or 9.15 etc. The exact birth time should be ascertained taking into account lords, sub-lords, sub-sub-lords of certain houses with the lord, sub-lord and sub-sub lord of the moon. This will provide the exact time of birth to seconds. Instead of 09.05 you will get 09.06.22 hours. Though, this may not affect the position of the planets in the natal horoscope, while making predictions based on sub-sub lords, this certainly helps. The next point to consider is the strength of the planets based on shadbala or six fold strength. They are positional strength, directional strength, temporal strength, kinetic strength, natural strength and aspectual strength. Again these six fold strengths have many sub sections. Unless the six fold strength is arrived, it is not possible to make accurate predictions. Ishta and kashta phal should be calculated to make predictions for dasa period. Ashtavarga should be calculated for all the planets as well as all the houses. Strength or weakness of a house should also be based on ashtavarga apart from ascertaining the bhava bala. Bhava bala is to be ascertained by drawing bhava chakra. The placement of planets in a bhava is also important. If a planet is placed in the bhava madya or centre of the bhava, the planet has more power. Instead, the planet is placed in a cusp, it loses its power. Then planetary aspects are to be taken into account to find out whether the aspect is benefic or malefic or neutral. While calculating the aspect, the exact distance is to be taken into account instead of the houses.
All the planets aspect seventh house from where it is placed. Assuming sun is placed in 2.30 degrees in the first house and in the seventh house a planet is placed at 28.50 degrees, then the power of aspect of sun diminishes on the planet that is aspected. To further strengthen the predictions based on dasa period, bodhakan, vedakan, pasakan and karakan of the dasa lord and their position are to be ascertained. The Rahu-Ketu axis should also be taken into account. Apart from all these factors, there is one more system called Arudhara Lagna or pada. Pada for each house should be calculated. Each horoscope will have one atma karaka planet depending on the degree it is placed. While calculating, placement of planets from Lagna, moon, sun, atma karaka planet and the yoga karaka planet of the horoscope should be taken into account. Indu lagna and hora lagna should also be calculated. Apart from studying the horoscope from D1 chart (the rasi chart), the placement of planets in other vargas to be ascertained. Navamsa D 9 chart should also be studied along with the rasi chart. Finally the relationship amongst the planets, transit influences, functional nature of the planets, conjunctions, combustion, retrogation, rays of a planet etc to be ascertained before making any prediction. Finally, the effective yogas are to be taken into account. The list is not complete. Therefore, a study of horoscope should be taken up with all these calculations. Further, to ascertain employment problems, a study of D 10 chart should also be taken up, for spirituality D 5, for spouse D 9 etc. This numeric indicates the division of a house (30 degrees) into as many parts as the numeric. In D 10 chart the division is 30/10. Such divisions go up to D 150. Normally Charts up to D 60 are used. If all these calculations are used while interpreting a horoscope, close to about 80% accuracy can be attained. According to me, 100% accuracy may not be possible.