Hemispheres and Quadrants for Nayantara
The axis linking the 1st house's cuspide (the Ascendant) to the 7th house's cuspide - the Descendant - divides the zodiac into two bowls, a superior bowl, in the South, and an inferior bowl in the North. Quoting an expression by the famous American astrologer Rudhyar, the Southern part and the Northern part correspond to two functions: "being" and "doing". Other concepts are also associated with this North and South distribution, such as introversion - Northern hemisphere - and extraversion - Southern hemisphere - being or appearances, inner life or external life, reflection or action, dreaming one's life or living one's dreams, the abstract or the concrete, backstage or limelight.
This is not about determination but about personal inclination: thus, some people will be thrown into public life despite a prominent Northern hemisphere. If this happens, however, it will not be due to their will, their taste or their deep nature. Conversely, a prominent Southern hemisphere will not bring about a famous destiny to its owner, even if he tends to turn the spotlight on himself, or if he looks for a more active life. It is a matter of deep nature and natural inclination. Of course, none of the typologies is "superior" to another.