You're all wrong about what "your sign" is anyway because proper astrologers* would see "your sign", (i.e the astral body associated with your personal essence) as being your moon sign not your sun sign. Sun signs are the popular short cut used by the newspapers because in a culture that uses a solar calendar (like ours) it's the only sign that most people will know. This all came about because the Daily Express published a horoscope for Princess Margaret when she was born and they got the largest postbag ever from readers demanding to know how they could get theirs done. In a scene probably a bit like something out of Scoop, the astrologer they had used tried to explain about Moon signs, difficulty of calculating them etc and got told to come up with something - hence Sun Signs, quickly copied by every other newspaper.
Nowadays calculating your moon sign is pretty easy using computers.
I know this shit because in the late 90s I was employed to write the blurb for a computer programme that let you see the position of all the planets/heavenly-whatsits at the time of your birth and read what classic astrology had to say about this. I wrote that bit. Took a year, because there are a feck of a lot of entries once you include Houses etc, also they wanted a relationship compatibility chart too. I knew precisely sweet fa about astrology so I had to read up on it as I went, but they had tried to hire trendy hippy astrologer Jonathan Cainer to do it but he started mentioning fees in excess of £1m (he was on £700,000 a year from the Mail at the time) and the company decided a complete know-nothing like me was quite an attractive option at £20,000. Never got any royalties though, they went bust literally months after the project was finished. Still got a copy of the disc though, if anyone wants a sneak preview of the future.
*competing theories do exist.