Why can the constellations of Gold Saints correspond to many dates, while the constellations of bronze saints and silver saints can only correspond to one date?

Generally, the narrow sense of the "birthday constellation" is only the "twelve constellations" (some modern people try to join the thirteenth "Ophiuchus" because of precession), and traditionally there is no so-called birthday corresponding to the eighty-eight constellations.

because

The zodiac is defined as the position of the sun when a person is born (the sun passes through twelve constellations a year, and this orbit is also called "Zodiac", so it is also called "Zodiac"), and the sun cannot pass through all 88 constellations.

② For a long time, there were only 48 constellations (Ptolemy constellations) in ancient times, and the so-called 88 constellations in modern times were divided into more than half.

Ask the Lord about the correspondence in the so-called "Saint saint seiya". A saint is just a position and does not necessarily belong to this birth sign. Theoretically, a person with a Gemini birth sign may also hold the post of Aries saint (except that the author usually deliberately sets the birth sign of the golden saint to match the position they represent).

Just remember: there can only be twelve (three) zodiac signs.