Some practical evidence does exist in support of the four angles - ascending sign, descending sign, mid-heaven, and deep-heaven. As to the rest, there is a lack of research.
I dabbled in astrology for many years - I learned to draw charts by hand using data from the ephemeris and read charts for a time. I did find a ton of truth and insights in charts, but reading them is extremely complicated. You need to consider the 12 hours, the 12 signs, the angles, and the configuration of planets (squares, trines, conjunctions, etcetera). Then there all sorts of other details, such as whether your key signs are fixed, mutable, or cardinal, and where the north and south nodes of the moon are.
Becoming proficient at reading charts is a craft that takes years. I rarely got to the point where I could make an intuitive leap, but relied on the analysis and reading of details.
A person's sun sign is on its own quite meaningless, you need to know the moon and ascendant positions at least to begin an astrological analysis. And some sun signs are weak in an individual. For example, my niece has four planets in Libra and sun in Scorpio, and she is far more Libran in character.
As to changes in signs, tropical astrology remains true. I would love nothing more to have four planets in Libra instead of four in Scorpio, but alas, I'm a true blue Scorpio. So is Charles Manson , but looking on the brighter side, we also have Indira Ghandi.
I'm Leo/Virgo now...my birthday is September 16. I don't even know anything about Leos; I've always been a typical Virgo!
Astrology is bunk.
I hear outside a million panicking birds, and know even out there comfort is done with; it has shattered even the stars, this creature at last come home to me.
Noooo, my whole life has been lived as a lie!
Japanfan I dabbled in astrology too, but only for awhile in my salad days. I'm a real Scorpio, with 4 planets in Scorpio besides the sun. The teacher in the course I took drew our charts. I forget the details but of all the trines in the universe, he identified the three worst to have, and I have two of the three. Every day the ephemeris would have bad news for me. It started to become a self-fulfilling prophecy so I quit looking/charting.
I have the same birthday as BYTCH. I wonder how many of the bad trines I have.
PL you were born years after me, so you should be safe because trines change constantly. Plus I think they are allergic to sparklies, so you have double protection.
I am so NOT a fecking Pisces! If ever there was a true Aries,,, It's MEEEEE!
Dont Hate! Gyrate!
And Jamesy, I would be concerned if I had to lose the Libra identity for a Virgo one
All you Virgo haterz can just shut it. We are the best. Just ask any of us. Those of you fortunate enough to have been moved into the group should cheer.
Those who never succeed themselves are always the first to tell you how.
My mother is a Virgo and I'm a Sagittarius(which btw really are the best ) with Aquarius rising (but my Moon is in Virgo sadly ) and she has exactly all the Virgo characteristics that make me want to pull my hair.