the souls purpose is the planet with the highest degree in the birth chart. the planet is called: Atmakaraka.
I don't think I understand what this means. Is "Atmakaraka" (I recognize this from Jyotish astrology) just the
designation (not the name) of what "Western" astrologers would call
"most elevated planet" in the chart? For example, if a person had Saturn in the 9th or 10th House, and there was no other planet that high in the chart, would Saturn be the atmakarata?
Back to the OP's question: My experience with NN/SN has been one that not everyone would accept, but I have found it to be very real and very accurate for me. For me NN/SN is all about an urgent karmic lesson that one has chosen to learn in this life. (It is not your main purpose in life, but it may be something your soul sees as a serious flaw that must be corrected ASAP. I have a Virgo SN conjunct Saturn in the 8th House and of course my NN is in my 2nd, and conjunct a stellium of Pisces planets.
This is where it may get too weird for some, so feel free to step off the train at this stop.
From childhood, I have always remembered my last past life vividly, even before I knew anything about astrology. And in that life I was a spoiled noble who lived well, spending money I had never had to earn - mostly copious inheritance, lavish gifts for favors which my title and position allowed me to grant, living rent-free in country mansions that belonged to others (as one type of lavish gift). I was also hypercritical, often very coldly, carelessly breaking hearts. Does this not sound like 8th House and bad Virgo?
In my present life, I received NO financial help from my parents (even for university) and NO inheritance from them either - they gave their entire estates to my step-families. I was never awarded for any good deeds or achievements with anything but kind words or a medal, and I was a victim of abusive criticism and mockery from childhood throughout my life. I was never taught how to handle money, was trepidacious about it, and though I earned enough by working very hard, I made unfortunate investments that caused me considerable and unpredictable loss. I have been close to financial disaster a number of times. Does this not sound like a correct karmic lesson for the spoiled, rich, coldhearted noble?
I became suicidal from my financial losses (I was financially "underwater" - owed twice as much as my entire net worth at one point through no fault of my own - long story), as well as from my loveless life of constant criticism. But I was blessed with individuals who appeared in my life and taught me more and more about karma just at the right moments in my life, and my suicidal thoughts changed to a glorious insight into my mission. I was cleansing myself of the evils of my past life by learning priceless lessons of empathy. I now have acute empathy for the poor and am extremely careful not to injure anyone's self-esteem or confidence. I was moving from my SN to my NN.
Admittedly, there have been numerous relapses that backfired on me and put me back in self-loathing and financial distress, but now I always know how to "get back on the path", to self-correct, to resensitize myself, to head toward my Pisces NN.
As if a perfect setup, my NN is the exact apex of a perfect YOD with Neptune sextile Pluto. As Tracy Marks describes it so well, when the two inconjuncts (150°) from the sextiled planets are powerfully activated by transit and/or progression, the apex is "awakened". And my apex is a Pisces NN in the 2nd conjunct Jupiter, Venus, and Mars (my own talents, my own money, my own core values, my own work). To me, this Yod has been a blessing - a perfect setup in understanding what the nodes mean. I had been such a "hard-headed a**h*l*", I needed more funneled guidance to my NN. (A Yod configuration looks like a funnel in the chart.)
So to me, the NN is the karmic lesson that is most urgent for you to learn, though it may not be your main purpose in this life. My main purpose in this life was to be an excellent teacher (that was perfectly determined by my Mercury, Sun, Moon, and Neptune placements - a whole other story) - and from all the feedback and rewards for my 30+ years of teaching, I believe I succeeded well in my main purpose, which may well continue next lifetime - there's always more that can be gained pursuing a great purpose.
And meanwhile, I learned to rely on myself, believe in my own talents, earn my own way in life, be very generous to and understanding of those less fortunate, be very sensitive to others' feelings and self-esteem, and never criticize what you don't understand or have never experienced.