Vargottama is a planet in the same position on the Rasi (birth) chart and the Navamsha chart A planet or the ascendant being in Vargottama obtains much potency to be favorable;
What is the Navamsha chart? What does it mean in your life?

Tapash Navamsha Chart
In Vedic Astrology, a lot of importance has been given to the divisional charts. The Navamsha chart is one of the most popular divisional charts, which has been given equal importance to the Lagna chart or the birth chart. The whole zodiac has been divided into 12 signs consisting of 30 degrees in each zodiac sign. When we divide 30 degrees into nine parts or divisions, each part or division is called a Navamsha or D-9 chart. The Navamsha is the next important chart after the birth/rashi chart.
Jyotish primary use of the Subcharts of which the Navamsha (9th subchart) is the most important. Navamsha is used to evaluate strength of the planets by observing whether the planet is in a friendly division, Exalted, Moolatrikona or own house.
Birth chart is the tree and Navamsha shows the fruit. A Planet that is in the same Rashi in the Birth and Navamsha chart is said to be Vargottama – very strong
In Navamsha chart Moon is also Moolatrikona in 4th house fully aspected by Jupiter
Vedic astrologers regard the Navamsha chart as the horoscope of the soul and a guide to marriage. It is the 9th Harmonic chart of Vedic Astrology.
So, your Vedic natal chart or Rashi chakra is the birth chart for your current incarnation, whereas your Navamsha chart gives you information as to where your soul got to in your previous life, and to the destiny it lived out then, and also how it evolved through previous existences.
The Navamsha chart is therefore a key to the aspirations of your soul this time.
Jupiter is Vargottama – in the best Avasthana of the Pisces subdivision ruled by Jupiter in the Rashi of Sagittarius. Thus Jupiter is strong (swakshetra) in its benefic aspect of the 1st house for self, the 5th house for children, intelligence and meritorious deeds, the 7th house for marriage and partnership and the 9th house for Father, Guru, Travel and Higher Studies. It also beneficially aspects Rahu, Saturn and the Moon. As Jupiter is in the Ascendant its beneficence will counteract 400 dosas (problems)
Vargottama is a planet in the same position on the Rasi (birth) chart and the Navamsha chart A planet or the ascendant being in Vargottama obtains much potency to be favorable;
What is the Navamsha chart? What does it mean in your life?
Vedic astrologers regard the Navamsha chart as the horoscope of the soul and a guide to marriage. It is the 9th Harmonic chart of Vedic Astrology.
So, your Vedic natal chart or Rashi chakra is the birth chart for your current incarnation, whereas your Navamsha chart gives you information as to where your soul got to in your previous life, and to the destiny it lived out then, and also how it evolved through previous existences.
The Navamsha chart is therefore a key to the aspirations of your soul this time.