Noemi, recalling the conversation of a few hours before, expressed a doubt that Fomalhaut would be the star to appear at the window.
"To be sure," said Carlino thoughtfully.

"I had forgotten Fomalhaut.

If it is not Fomalhaut now, it will be Fomalhaut then." But Noemi had other difficulties to suggest.

What if no star appeared at the window, either large or small?
For this difficulty Carlino promptly found a remedy.

The star will be there.