The Corrected Signs of the Zodiac

SciAm explains:

Astrology is currently experiencing a remarkable renaissance—especially on social media, ...

Toward the end of the fifth century B.C.E., Babylonian astronomers divided the ecliptic into 12 equal sections of 30 degrees each, analogous to their calendar’s 12 months of 30 days each. In doing so, they developed the first known astronomical coordinate system. They assigned each section a constellation located in the night sky along the ecliptic at that time of the year.

The language of Astrology leads people to believe that if their sign was Aries, then Aries would be visible overhead on their birthday.

This is wrong for a couple of reasons. If Aries is your sign, then the Sun would be blocking that constellation on your birthday. So you would not see it because of the brightness of the Sun. It is also wrong because the Earth has shifted, and so the alignment of the stars, in the last 3000 years. Also, there are 13 signs of the Zodiac.

The above article tells you the true calendar of the constellations.