Some may find new forms of Astrology hard to believe, as they have associated with being a certain star sign for all of their life. However, most forms of astrology do not align with the science of astronomy and the observations of the sky due to two factors: the precession (or drift) of the equinoxes & the dimensions of constellations.
The cornerstone of Astronomical Astrology is the actual observable locations of the Sun, Moon or planets in relation to the eighteen constellations of the extended zodiac.
Astronomical Astrology does not dismiss the aspects of what someone has believed throughout their life, as it must be realised that thoughts are their own energies, which can form a layer of reality around an individual. In which case you may find that you exhibit aspects of the star sign you think you are, but at the time you will find that you react sub-consciously due to the energies which are the actual astronomical aspects.