In Indian Astrology Jupiter is considered the most beneficial planet. Even if all the planets are ill posited in a horoscope chart jupiter's aspect can bring some releif for that house. Jupiter rules the houses Sagittarius (Danush) and Pisces (Meena) in the rasi / zodiac. Jupiter is exalted in the sign Cancer (kadaka). Jupiter is auspicious for Mesha laga (Aries ascendant). Jupiter's vimshottari dasa period is 16 years. It follows the dasa of rahu.
Generally Rahu dasa is not good if rahu is not posited well. For me (mesha lagna) rahu is posited in Leo (simha rasi) sign. This sign is enemic for rahu. Natural malefics likfe rahu should not occupy the 5th bhava which is a tri-kona house. So this comibination gave me many sufferings and failures during rahu dasa. I faced many difficulties during this 18 years rahu period. My career was not stable. I got frequent job changes. Was not well paid for my job. Mental sufferings were experienced. Physical comfort were deneid. Frequent fruitless travels were carried out. Good posited rahu will give health, wealth, victory over enemies, raise in position etc. Ok now its is all over. As of yesterday (10-05-2010) jupiter dasa starts for me. In my horoscope jupiter is both 9th lord and 12 lord. That is Guru is lord of bagya sthana and vyaya sthana. This means subh vyaya or expenditure of good deeds. Also jupiter is posited at 4th house. The fourth house represents mother, house and vehicle. So during my jupiter dasha these 3 houses will be activated. Also the 2nd house where the fourth lord moon is located will be activated. Jupiter also aspects 8th, 10th and 11th house by its 5th, 7th and 9th aspects. These houses also will get benefits during jupiter dasha.
May the planet lord jupiter show me a prosperous path in life!