HOROSCOPE OR BIRTH CHART- DASHAS

The Horoscope or birth chart, gives the basic indications for an individual or event. For example, Mars in the 3rd house (bhava) means success through one's own efforts. The question then arises as to when this will occur; in one's youth, middle-age, old-age, or in a mixture of these timeframes?
It may also happen that contradictory indications occur. How can these occurrences be reconciled? If Mars is indicating success, but Sun indicates obstructions, how do we integrate these opposing forces to arrive at a consistent picture of the birth chart?
The answers to these questions can be found in the dashas, which are systems used for timing of events in Jyotish. If two grahas show opposing indications, it may indicate that each will occur, but at different times. Part of one’s life may show success and rise in career, while other parts may show obstructions and struggle. The dashas allow a determination of when these periods will express themselves, and to what degree. Both influences may also occur simultaneously (success, but with much effort).

There are many dasha systems available in Jyotish. Based upon the birth chart each system has its own particular uses and rules for when they should be used. The most popular dasha system is Vimshottari. This belongs to a class of dasha systems that are nakshatra-based . Nakshatra-based systems use the nakshatras to calculate the start of the dasha cycle.
Vimshottari dasha, is calculated based upon the nakshatra position of Moon at birth which determines the start of the dasha, and each graha from Sun - Ketu has a dasha period associated with it. Suppose Moon is in Pisces at 16-10 (16 degrees, 10 minutes of arc) at birth. Since there are 27 nakshatras of extent 13-20, this corresponds to the 26th nakshatra, which is Uttara Bhadrapada, whose ruler is Saturn. Hence, this person was born into the Saturn Vimshottari dasa period
It must be understood that the dasha result is strongest, while the bhukti, which has a powerful effect, is secondary in its influence., the most specific consideration in delineating dasha bhuktis are the houses ruled and occupied by the planets involved, as well as planetary