Javert is asking the stars to help guide him to Valjean so that he can capture him. He is a religious man- he sings as he is down on one knee in reverence- "LORD LET ME FIND HIM/THAT I MAY SEE HIM SAFE BEHIND BARS." He is asking for devine interevntion in achieving his goal: Valjean in prison. And the litteral: he admires the stars; he calls them 'sentinels' and says they are "silent and sure." They are always in their place and strong, doing their job... like Javert himself
"TO LOVE ANOTHER PERSON IS TO SEE THE FACE OF GOD"- LES MISERABLES---
"THERE'S A SPECIAL KIND OF PEOPLE KNOWN AS SHOW PEOPLE... WE'RE BORN EVERY NIGHT AT HALF HOUR CALL!"--- CURTAINS