'Ninth' in the Bible

Now Peter and John were going up to the temple at the hour of prayer, the ninth [hour].

About the ninth hour of the day, he saw clearly in a vision an angel of God coming to him and saying to him, "Cornelius."

And Cornelius said, "{Four days ago at this hour}, [the] ninth, I was praying in my house. And behold, a man in shining clothing stood before me