Nostradamus wrote in his epistle, that "Only those divinely inspired can predict particular things in a prophetic spirit."
The power to predict the future accurately belongs to those whom God chooses, and no one else.
How do you interpret the prophecies of Nostradamus?
Joseph of Egypt replied to Pharoah's officers concerning interpretation thus, in Genesis 40:8, "Do not interpretations belong to God?"
Even years of research does not make the interpretation clear without that tiny bit of inspiration that offtimes comes from the Spirit of God in quiet moments of reflection. It's that inspiration that sets one on the right path, shows the meaning, and reveals the connections between prophecies that unveils the complete story.