I have heard many times that Jesus was crucified at 9:00 a.m. and remained on the cross till 3 p.m.. How do we know that? The Scriptures say something like the third hour:
Matthew 15:25: And it was the third hour, and they crucified him.
But how do we know that the third hour was exactly 9:00 a.m.?
Do we draw information on that point exclusively from Scriptures?
Is it something like a known fact from Hebrew tradition?
Or, perhaps, something else ?