Source 1: Degree table inconsistency. Different nadi texts assign different meanings to the same degree ranges. There is no canonical "Bhrigu Nadi degree table." A Venus at 15° Libra might mean:
• Text A: "Early marriage to young, wealthy partner."
• Text B: "Marriage delayed until 35; partner is spiritual."
• Text C: "Multiple marriages or romantic entanglements."
How do you choose? Most practitioners select the text or interpretation that fits their existing beliefs or the client's narrative. This introduces confirmation bias.
Source 2: Progression calculation. The 1°/year Jupiter progression is a simplification. Actual Jupiter speeds vary (retrograde periods, perigee/apogee effects). Over 30 years, the cumulative error can be 2-5°, shifting event windows by years. This error is rarely acknowledged.
Source 3: Planetary motion uncertainty. Birth time uncertainty (±5 minutes) is often ignored, but it affects starting planetary positions and introduces further error into progression calculations.
Source 4: Vague interpretation. Nadi texts are often poetic and ambiguous. "Jupiter touches Mars: expect action" is not specific. The native might interpret this as marriage, business, accident, surgery, travel—all are "action." Prediction is so broad it is unfalsifiable.
Source 5: Post-hoc rationalization. After an event occurs, practitioners read the chart again and declare "It was written in the nadi." But before the event, the prediction was unclear or wrong. Nadi feels accurate in hindsight, which is how all non-specific prediction systems feel.
Mitigation: Use Nadi as one voice among several (Parashara, KP, classical dasha). Check predictions against multiple systems. Test rigorously on your own charts. Track hits and misses honestly. Do not rationalize misses.
Table disagreement. The degree-meaning tables that the method depends on differ between sources, sometimes assigning contradictory significations to the same degree. Because no table carries decisive authority, two competent readers can produce opposite readings from the same chart and neither can be shown wrong from within the system.
Progression rate error. The convention that Jupiter advances about a degree a year is an approximation. Jupiter's real motion varies with its position in the orbit and reverses during retrogression. A prediction built on the flat rate can drift by a year or more across a lifetime, and the drift grows with the distance from birth.
Interpretive latitude. Where the orb for a combination is not fixed, where the directional scheme can be drawn more than one way, and where the degree table is chosen after seeing the chart, the reader has enough freedom to reach almost any conclusion. Each degree of freedom is individually defensible; together they make the method hard to falsify.
The remedy. Fix everything you can before reading: the table, the orb, the directional scheme, the progression rate. Write the prediction down with a date, in terms specific enough to be wrong. Then check it afterwards without adjusting the method. This is the only way to find out whether your Nadi work has predictive value, and it is worth more than any argument about the tradition's authority.