What Mercury is read as here
A path that goes through understanding. Mercury signifies speech, discrimination and the student, and the Buddha is the avatara of seeing a thing as it is rather than as it is wished. Read here, it points at practice that is investigative - study, enquiry, and a scepticism that is not the opposite of devotion.
The Dashavatara form
In the Dashavatara scheme, Mercury carries Buddha. That table is Brihat Parashara Hora Shastra ch. 2, vv. 5-7 - the one mapping quotable to verse, which is why it is kept separate here from the rest.
The other forms this graha is read as
In the adhidevata and pratyadhidevata lists, and in widely-taught lineage practice, the same graha is also read as Vishnu. The sourcing here is weaker than for the Dashavatara table, and the order carries no preference. They are listed so a reader sees the actual spread rather than one name presented as settled.
How the rule arrives at a graha
This is Jaimini's procedure, from his Upadesha Sutras (the Ishta Devata material sits in the 1.2.68-1.2.82 range). The twelfth from Karakamsa is the Jivan-muktamsa, the house of moksha, so the deity said to carry the soul to liberation is read there. The precedence is: a planet occupying that sign first, then a planet casting rashi drishti on it, and failing both, the lord of the sign.
What this does not claim
Three things stay explicit. First, the procedure yields a graha, not a name - the name is a reading of that graha, and there is more than one reading. Second, the sources genuinely diverge: some teachers refine through D24 before D9, and some lines reverse the counting direction when the Atmakaraka sits in a feminine sign; what is used here is D9 and zodiacal counting. Third, a chart-derived deity is a tradition rather than an instruction - the classical texts treat it as a pointer for practice, and nothing in them says a person cannot worship as they choose.
Frequently asked
- How is the Ishta Devata calculated?
- Take the Karakamsa - the Navamsa sign your Atmakaraka occupies - and count to the twelfth sign from it. Then, in order of precedence: a planet occupying that sign, failing that a planet aspecting it by rashi drishti, failing that the lord of the sign. The planet you land on is the finding.
- Is my Ishta Devata Buddha?
- Buddha is the Dashavatara reading of Mercury, quotable to Brihat Parashara Hora Shastra ch. 2. The same graha is read as Vishnu in the adhidevata lists and in lineage practice. These are different schemes, not a ranking, and no calculator is positioned to choose between them for you.
- Does birth time matter for this?
- Completely. The whole chain starts from the Atmakaraka, which is whichever planet sits at the highest degree in your chart. A shift of a few minutes can change which planet that is, and every step after it. If your birth time is uncertain, treat the result as provisional.
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