What constellation is September 1 1? I want to ask about the constellation.

That depends on whether the time you give is the solar calendar or the lunar calendar. If it's a solar calendar, it's a Virgo. If it's the lunar calendar, it's hard to say, because you didn't give the year and there's no way to convert it for you. If you are interested in horoscopes, you can download the life calendar and watch horoscopes for free every day.