There are 12 Sun signs of the zodiac
The zodiac means a circle of animals. The Sun passes along a path called the ecliptic and astrologers base their interpretations according to centuries of observation and correlation using the axiom “as above, so below”.
This is the synchronicity of events on earth happening at the same time as the planets are travelling through the signs in the sky.
For instance, Mars is connected with war and is a red planet. Mars governs Tuesday (named after Thor) and many wars start on Tuesdays.
To see what the sky looked like at your birth, and what it looks like now in real time, go to www.stellarium.org This brilliant astronomy programme is free to download. It is simply amazing to use.