This discussion should not be continued on this forum. It's appropriate place is on Solunars.net, which is devoted to the subject. It's also off-topic from the thread itself, and therefore is subject to being deleted without comment or notice. (The expectation here is that, while a bit of brief flitting off-topic naturally occurs, the thread should be brought back to its primary topic.)
However, I'll respond to this last post on the subject:
@Surg said
"Jim, I have doubts about this one - I was born on March 28th, this makes me an Aries."
No, it makes you a Pisces Sun - except in the fictional Equinox-based zodiac of pop astrology. The Sun doesn't reach the actual astrological constellation of Aries until mid-April.
And, of course, the Sun-sign is only one part of the horoscope. A very strong part, but only one part. It's not feasible to do a point-by-point rebuttal without the whole chart to reference.
"By the link you posted, I ought to be Pisces, however both the standard and the sidereal zodiac sign interpretations fit me more or less perfectly, so I can't really see why one would prefer one over the other."
While checking one's own chart is good to catch one's attention, that's not really the basis on which it's reasonable to decide. Anecdotal evidence is always a weak argument. But we have over half a century of statistical projects (some very small, some medium-sized and adequate, some huge and overwhelming) that document unequivocally where the actual boundaries of the signs are located. You may want to check the introductory essays available on www.solunars.com.
"Can you please explain to me why one would be preferred over the other? I don't seem to be able to get a good grasp of how this works."
See above (for this and other questions you asked).
"Why is Aries last?"
Convention. (It doesn't really matter what's first, last, or in the middle for most purposes.) Taurus was the original first sign of the zodiac.
"Is this fit into the Tarot? I always thought the Tarot was based on the Tropical Zodiac and houses, though admittedly, I know almost nothing about astrology."
Tarot's use of astrological symbols isn't exactly based on any kind of astrology. It's based on leveraging astrological symbols as a languagte for a different purpose.