Rules for Mahadasha
When a planet is accompanied by a malefic or debilitated planet in an ascendant without being affected by it and becomes debilitated or malefic in a varshaphal is counted under the influence of mahadasha from that specific date.
When a planet is debilitated or malefic and is also accompanied by a malefic or an inauspicious planet then it is considered to be under the influence of mahadasha since the day it enters the ascendant.
During the phase of mahadasha an afflicted planet is not able to get any help from its friendly planets. But, enemy planets have its full effect.
The planet of mahadasha have the same effect on other planets of the horoscope as it is without this condition.
If planets in the 1,4,7 and 10th house are accompanied with strong or exalted planets in other houses of the horoscope then Mahadasha will get cancelled.
If the planet or birth and planet of the sign are auspicious or exalted in a horoscope, then also Mahadasha do not take place.
Time of Mahadasha of Planets
The Mahadasha of Jupiter will begin when Saturn will be in the first house, Ketu in the third and sixth house, Jupiter in the tenth house and Rahu in the ninth and twelfth house of a horoscope.
Mahadasha of Sun begins with Sun itself is in the seventh house and Mercury is in the twelfth house of a horoscope.
Mahadahsa of Moon begins when Saturn comes in the first house, Mercury lies in the fourth house, Venus in the sixth house, Moon in the eighth house and Jupiter in the tenth houseof a horoscope.
Venus’s Mahadasha begins when Mars is in the fourth house, Venus is in the sixth house and Jupiter lies in the tenth house of a horoscope.
Mahadasha of Mars begins when Saturn is in the first house, Mars is in the fourth house. Venus is in the sixth house and Rahu lies in the ninth and twelfth house of a horoscope.
Mahadasha of Mercury begins when Saturn lies in the first house, Ketu in the third and sixth house, Jupiter in the tenth house and Mercury itself in the twelfth house of a horoscope.
Saturn’s mahadasha begins when Saturn occupies the first house, Ketu is in the third and sixth house and Jupiter is in the tenth house of a horoscope.
Mahadasha of Rahu begins when Moon is in the eighth house, Rahu is in the ninth and twelfth house and Jupiter in the tenth house of a horoscope.
Mahadasha of Ketu begins when Saturn is in the first house, Ketu is in the third and sixth and house, Su is in the seventh house, Jupiter is in the tenth house and Mercury is in the twelfth house of a horoscope.