The decibels of these constellation vectors represent that constellation, so it is better to explain why.

Aries (Capricorn) Taurus Gemini Cancer

Leo Virgo Libra Scorpio

Sagittarius Aries Aquarius Pisces

As for the reason, it is likely that the ancients represented the constellations according to the star chart. It looks different from the current constellation, because the shape of the constellation will change a little after thousands of years.