Vedic astrology largely depends on the birthtime, place and date for casting the horoscope of the individual and consequently for making worthy predictions.
However great an astrologer could be, if he has to depend on inaccurate chart (cast based on inaccurate data) his predictions would turn awry. Getting the wrong birthtime is One of the best ways to turn a horoscope to a ‘Horror”scope.
• Watches of the doctor/nurse cannot be expected to be accurate, nor can we expect the watch to have been synchronised with standard times.
• Will the doctor attend to the mother who is in labour or be looking at her watch to make sure the astrologer gets the perfect birthtime of the baby.
• In addition to these material reasons, there can be a conceptual inaccuracy on what signifies the birth time.
o Some say birthtime is the one when the baby starts cryingo Some say it is the time when the baby is touched by the mother for the first timeo Some say it varies from yuga to yuga and for Kaliyuga it is Bhoo-sparsa, meaning the time at which the baby is in contact with the earth (read : cradle/bed)
• Multiplicity of Almanacs & Panchangas used, each differing with the other
• Computational errors by your astrologer
With so many features waiting to conspire you to land up with the wrong birth time, chances of the birthtime in the natal chart being inaccurate is much higher compared to that being accurate. No question about that.
However the prescription is indirect . There is a branch of Vedic astrology titled “Nashta Jathaka”, believed to have been authored by the inimitable Varaha Mihira ( Mihira who got the honorific prefix Varaha, for having predicted the death of a prince in the hands of a Pig).
How to judge whether the chart is accurate:
There are several methods. I have listed out some:
• Ganesha Deivagna’s Lagna based verification (read my short article on this technique: https://scribblingsofark.blogspot.com/2017/06/how-to-verify-if-lagna-is-correct.html)
• Krishnamurthi Paddhathi (KP astrology) based cuspal sublord link with birthstar theory
• Sthree-Pursha vela based verification. This theory believes that Child born in Sthree Vela will only be a girl and one born in Purusha vela will only be a boy.
Several methods exist including:
• Calibration method of synchronising various known events in the native’s life with the planets that the horoscope indicates will cause those events. Example: With a known marriage date run a test on whether the marriage-granting planets were active during that time (Vimshottari Dasa) and iterate for various birthtimes.
o Continue the iteration for other key events in life . Iterate until all the timings of major events coincide with result granting planets (and dasas)
o The handicap in this method is when the native is too young to have witnessed key events in life.