The number 150 is central to the framework presented in this site and in Nadi Astrology: A Comprehensive Interpretation of All 150 Nadi Amsas and Their Planetary Results. Rather than treating the zodiac as a broad twelve-sign map alone, the Nadi approach works with much finer divisions.
A fine division is useful because two charts can share a sign placement while differing significantly in degree. A Nadi Amsa framework attempts to capture that additional layer of detail. In practice, the interpretive value comes from combining the Amsa with the Ascendant, planets, signs, and other timing or chart factors rather than reading an Amsa in isolation.
For students, the best method is to build an organized reference. Record the Nadi number, its name, the relevant degree range, and the planetary indications associated with it. Then compare examples instead of relying on a single chart.
The 150 Amsas can therefore be viewed as a study architecture: a way to break a large symbolic system into manageable units. Whether one approaches them spiritually, traditionally, or analytically, consistency in the method is essential.