I just wish to add that as for the Part of Spirit ...it is also known as the Part of Soul, which might aid in the understanding as to the Sabian symbolism.
Every five degrees through the Zodiac the symbolism changes in nature and it does that three times and then repeats itself. Each of the three are identified and labeled as levels , by the late great Dane Rudhyar, and He labeled the first five degrees of a Sign that of "Actional". The second five (degrees 6 through 10) "Emotional/Cultural" and the third group of five degrees (degrees 11 through 15) that of "Mental/Individual".
I've proposed a few different terms for the three levels but I'll keep this strictly "by the book", according to Dane.
Your Part of Fortune is that which you must activate via the symbolism in the manner appropriate to your provenance in life.
For an example. I believe that Yeshu'a of Nazareth aka Jesus Christ, was born with a Part of Fortune in the 19th degree of Pisces which has the Sabian Symbol of "A MASTER INSTRUCTS HIS DISCIPLE", which out of all the 360 possible symbols one might find to be their Lot in life (pun intended) that of the 19th of Pisces couldn't be more appropriate.
The 19th degree is in the 1st level of the second set of three in the Sign of Pisces and therefor it is an "Actional" symbol. It must be actively applied in ones lif in order to produce the most fortuitous circumstances that will assist you in fulfilling your life's dharma. When one has the Part of Fortune conjunct their M.C. it is considered to be most fortuitous as the M.C. represents the "HOW" of the chart axis symbology, i.e. the four Sings and their degrees of the Asc., Desc., M.C. and I.C., which all together are your basic life path imprint. or blueprint if you prefer. Who, Where-to, (or Whom-to), How and Why. To follow a spiritual path one reads the M.C. as "HOW" and the I.C. for "WHY" and the reverse for mundane readings and horary and such. (this is where I do diverge from Rudhyar but all his writings indicate that He was aware of the two possibilities but likely never amassed enough evidence to prove it). To have ones' Part of Fortune conjunct their M.C. ...the "HOW" of you life path imprint is one and the same as that which produces the most fortuitous circumstances. For a mundane chart it is most fortuitous to have it conjunct the I.C.
Now, maybe you can understand better, why it is so important to keep the diurnal, nocturnal birth question out of it?
To switch them around only leads to "the wrong marching orders"... imh, but much experienced, opinion.
As you have the 7th degree of Scorpio for you Part of Fortune, which happens to be a significant degree Sabian Symbol from my own chart, I know it well. It is an Emotional/Cultural symbol and what it is describing is the attitude, the persona, the psyche that you should assume in your day to day life.
As Rudhyar sated in the text he wrote for that degree, (From "An Astrological Mandala"), "It refers symbolically to a quest for "under-standing" — i.e. for what lies under the surface waves of daily living." and as Dane went on further in the summary, (and, please note that the symbol for Scorpio 06* is about the 'Gold Rush' tearing men away from their homes and native lands) (ibid.), "The contrast between "deep-sea divers" and "men of the gold rush" is significant. It presents in an interesting manner the opposition between a first stage and second stage symbol in the five-fold sequence of cyclic phases. The inward quest opposes the outward search for the great social symbol, gold. It should lead to a DEPTH REALIZATION of the very roots of consciousness."
This should become your 'core consciousness", how you should see yourself in human society, as one not allured by the material things that the world offers but that of a man of great understanding of what lies beneath the cause and effects of the human condition.
The Part of Soul/Spirit, I have found to be about what the Soul must realize at some point in life and it is about the Soul.
I can think of a few examples that might make explaining it easier but to be honest the one that you might best understand is that of my own Part of Soul.
I lived my life up to age 51 believing that I was nothing more than a college dropout turned tradesman that lived by the labor of sweat and muscle all those years and suddenly "washed up" with physical injuries at age 47. Six months to the day after I turned 51 I found that there was a second calling for me that was far beyond any I would have ever dreamed of and I subsequently discovered, through the aid of an excellent clairvoyant that had already proven their talent to me via other matters, that I am the reincarnation of someone that was "born for a purpose in service to a higher power", God if you prefer.
It was from that which led to the understanding that I learned that the Sabian Symbols are symbolically active, that the symbolism is actually descriptive of the aforementioned "Life Imprint or Blueprint" via the chart axis, and that the Astrological Parts, and that of all the House cusps as well.
Thus properly enlightened I finally understood what my Part of Soul in the 10th degree of Aquarius meant as to in relation to myself.
Check it out, if you will?
(ibid.)
"AQUARIUS 10°: A MAN WHO HAD FOR A TIME BECOME THE EMBODIMENT OF A POPULAR IDEAL IS MADE TO REALIZE THAT AS A PERSON HE IS NOT THIS IDEAL." ...and Rudhyar's summation and "keyword(s)" (in bold type) are, "This fifth symbol in the sixty-second sequence brings to our attention an issue that is basic and may confront us in various forms. Person versus archetype. This can mean a critical need for SELF-REVALUATION."
As for having been the embodiment of a popular ideal goes, I was about the best at y number one trade, painting, that one might find and back in that day I was known to all as "Painter Dave", whether they knew my last name or not or anything else about me.
I hope this helps you in the understanding.