Understanding the game loop

So I’ve been using the game loop below for most of the games I’ve made and as I was just going through it I found there is one part I’m having trouble
trying to understand, specifically the line just below.



delta += (now - lastTime) / nanos; 


I understand we are finding the time difference and adding it to the delta variable but I don’t understand why we are then dividing it by the nanos variable (1000000000 / 60). I pasted the full game loop below.


 long lastTime = System.nanoTime(); 
			final double nanos = 1000000000.0 / 60.0; 
			double delta = 0;
			int frames = 0;
			int updates = 0;
			requestFocus();
			while(running){
				
				long now = System.nanoTime(); 
				delta += (now - lastTime) / nanos; 
				lastTime = now; 

				 while(delta >= 1){
					gameUpdate();
					delta--;
			
				}
					render(); 
				
	   }
	}
    } 


If anyone could help me by explaining whats happening on the line I pointed out, it would be very appreciated. Thanks!