Hello, please help me to answer why the moon constellation measured by the online astrolabe is different from that measured by a single moon constellation query.

Constellations are all born in the solar calendar, not the lunar calendar. It is best to be specific about the specific time of birth, because the layout of the zodiac will be different because of the different birth time, and the time may be different in ten minutes. If you look up the horoscope, you can search the first website of Numerology Training Hall for horoscope and specific explanations on Baidu. Personally, I think that is more accurate and easier to understand. I hope my answer can help you again.