What is the difference between Sagittarius and Ophiuchus?

From an astronomical point of view, Ophiuchus is a constellation. Sagittarius is an astrological point of view ~ Although Ophiuchus also crosses the ecliptic 12, it can't be used for divination … I understand it this way. Whether Ophiuchus can astrology has actually been controversial for many years ~ Let's think that he is Sagittarius for the time being … The public accepts this ~ I was born in the overlapping part of Sagittarius and Ophiuchus ~