I want to know the answer to the following question:
What year did Chinese astronomers start to observe comets?
All the background I'm provided with is that "By the 12th century, they could reasonably accurately make predictions of eclipses, but the knowledge of this was lost during the Ming dynasty, so that the Jesuit Matteo Ricci gained much favour in 1601 by his predictions.". Is that enough to answer the question?
Answer: no