What does the centaurs Ronan and Bane's statement of "Mars is bright tonight" mean?
Ronan sighed. He flung back his head and stared at the sky. ‘Mars is bright tonight.’
Philosopher's Stone - page 184 - Bloomsbury - chapter 15, The Forbidden Forest
Bane walked over to stand next to Ronan. He looked skywards.
‘Mars is bright tonight,’ he said simply.
‘We’ve heard,’ said Hagrid grumpily.
Philosopher's Stone - page 185 - Bloomsbury - chapter 15, The Forbidden Forest
What does this mean? What does this mean in relation to Harry? Was there some kind of significance behind "Mars is bright tonight"?
A canon-based answer would be great!