I hate astrology stuff (I'm really not a Libra at all, especially the last 5 years or so), but I love personality test stuff. Depending on how I take it, I'm either and ENTJ or INTJ with the Meyers Brigg.
Meyers Briggs, as well as David Kiersey's work that came after in the same vein, .... is .....
ASTROLOGY!!!
I can prove it. They all take their work from Carl Jung and his work on archetypes and think it is "psychology". In fact, Jung spent many years and up until his death doing astrological charts, evidenced by letters to Freud in 1906 and continuing into 1911; and stated he thought that many problems found in psychiatry can find answers that are pre-ordained in the stars.
I kid you not. I had some interesting emails with Dr. Kiersey (and his son) over the subject over 8 years ago .. maybe 10?? Anyway, the MB became more like Kiersey's work and Kiersey's faded away to be replaced by his more ambitious efforts on different IQ's .. sports, mechanical, etc. But that is another story ...
The MBTI states quite clearly it is based on Jung's work, who in turn states his work borrows and is based on many ideas found in astrology.
Earth, air, fire, water ... the four basic elements ... move it around a little and you get the astrological signs with leanings in one direction or the other that are accounted for with rising sign, moon, Venus and Mars influences, etc. And alchemy. Jung was big on alchemy, too.
You should see the look on the faces of "facilitators" when they discover their "scientific" MBTI is based on (and a poor rip-off of) astrology.
Google it .. "Jung astrology Freud letter" and see what you get.
"While studying astrology I have applied it to concrete cases many times. ... It is an apt tool only when used intelligently. - C. G. Jung: Letters, volume 2, 1951-1961, pages 463-464, letter to Robert L. Kroon, 15 November 1958
Yep .. Jung used astrology to help his psychiatric patients all the way until his death.
Amazing, eh?