Vedic Astrology has been studied under three most popular systems 

The Parashari System: Maharshi Parashar in this system has described the complete system giving priority to the  planets more than the signs(rashi) .

The Jamini System: In this system rashi have been given more importance as compared to the planets. 

The Tajik System: Tajik is a greek system that has given the theory of aspects and Tajik Yogas. These are mainly applicable in Prashna Shastra and in Varshaphal. As per this system,  the natal charts are not only the chart on the basis of which predictions can be accurately drawn, rather, some more considerations to be taken into account for accuracy. This system is based on Parashari system. In this also as parashari there are 9 planets, 12 houses and 12 Rashis.. 

Muntha: It is the yearly progression of the birth ascendant @ one Rashi per year. for example, if the birth rashi is Aries then just after one year Muntha will fall on Taurus and in the successive next year Muntha will be in Gemini. This will continue till it reaches back to the original sign  Aries. 

The combination of all three systems has made the astrology little more complex but more scientific and logical. 

The Sun moves with respect to earth at the rate of 30 per month. He takes twelve months to complete one cycle through the zodiac. He returns to the position occupied by him at the time of one’s birth after every one-year period. At the exact moment when Sun returns to the exact position he occupied at the time of a person’s birth, a new year is said to commence in the life of that person. A chart is casted on the basis of the planetary positions at that time. This is called as Varshaphal kundli or Annual Horoscope . The lord of the ascendant of the varshphal kundli is known as the varshesh. This planet has a significant importance in that year. The longitude and latitude of the birthplace must be used in casting this chart, irrespective of the place of living at the commencement of the new year.

In the similar method Monthly horoscope charts can also be drawn A year is divided into 12 months and a new chart can be cast at the commencement of every new month. This is called Tajaka maasa chakra or a Tajaka monthly chart.A year is the period in which Sun moves by 360º. A month is the period in which Sun moves by 30º.

A month is again divided into 12 shashti-horas. Each shashti-hora period consists of 60 hours, i.e. 2.5 days. At the beginning of every shashti-hora, a Tajaka shashti-hora chakra(Tajaka sixty-hour chart) is cast. In the period corresponding to each Tajaka sixty-hour chart, Sun moves by 2º30'.

In other words, we can cast a chart after every 2º30' motion of Sun and use that Tajaka sixty-hour chart to predict events in the 2.5-day period commencing then. There are exactly 12 such charts in a one-month period.

Tajaka annual chart is basically the commencement chart of mahadasas as per Sudarsana Chakra dasa. Tajaka monthly chart is basically the commencement chart of antardasas as per Sudarsana Chakra dasa. Tajaka 60-hour chart is basically the commencement chart of pratyantardasas as per Sudarsana Chakra dasa. By going to finer levels, we get 5-hour charts 25-minute charts and 2-min-5-sec charts. Each chart shows about the corresponding period will be.

 To know about your Varshphal Kundali,please click on that link:: Varshphala Kundali