Astrology is a mythology based on things like your "sign" which refers to the position of the sun in the celestial zodiac (the 12 constellations along the ecliptic) on your birthday. This system was established almost two thousand years ago. If this mythology were true (and you believe your horoscope) can you use the dates for your "sign" based on this 2000 year old system?
A) No, because 2000 years is almost 1/12, or one full sign shift, in the zodiac, so the 2000 year old signs are off by almost one full sign.
B) Yes, any changes are insignificant in 2000 years.
C) No, although the precession shifts the equinox position, the other zodiac positions do not change because they are fixed to the celestial sphere.
D) Yes, the dates are fixed; your sign is your sign.