Why are we so fascinated by horoscopes, astrology, birth signs, star signs and psychic ability? You should take it as a broad canvas to be painted as the day goes along.
I know that my partner often reads his stars too out of curiosity. The Sun entering Aries heralds the Spring Equinox of equal days and equal nights. These segments have a relation to the sign of that person.
This reassures them in some way that this relationship might work just fine because Mr Right has a compatible birth sign to theirs. Astrology can get so complex. While Aries is very individualistic sign, Mars energizes other planets or houses of the zodiac.
If you, therefore, want a complete and accurate picture, you need to read and analyze both the Sun sign and the ascendant sign. Our job with the Sun in Scorpio is to be role models for others in the highest use of power.