Specialty of Indian Astrology
There are several differences between western and Hindu methods. Western astrologers follow a system of presenting the planets as they are in the sky, which is known as sayana system. Hindu astrologers follow nirayana system wherein the shift of the earth is taken off called ayanamsha.
Vimshottari dasa that treats the human life span to 120 years is most reliable one and is also widely followed.
Hindu astrology has well developed methods for matching charts for marriage/business partnership. Election astrology (muhurta) is well developed in Hindu astrology by study of stellar behavior. In western system, the matching is done merely by characteristics of signs like watery, fiery, etc, and muturta is done with reference to significators of the natal chart.
In western system the annual chart used to find the results of a year from birth day to next birth day is merely a simple mathematical progression of natal chart. But, the Hindu system uses different charts as on birth day, a chart is made for the time when Sun enter the same position as in the natal chart and position of other planets are found out. Even a dasha system is used.
When it comes to mundane charts, in western world charts are made for a new year which eventually begins at zero hours standard time of a country which is in no way related to planetary movement.
Hindus have a good tool box and the Westerner’s is still primitive. Astrologer should know when and how to use them.