why does <PERSON> have his first transformation at hogwarts?
In Harry Potter and the Prisoner of Azkeban, <PERSON>, the werewolf, has to take a potion every full moon to keep his inner wolf under control. It causes him to miss class. Now, the first time it happens (the students are told he is sick), it's stormy outside, so the clouds would be covering the moon.
" 'Sorry I'm late, Professor <PERSON>. I --' But it wasn't Professor <PERSON> who looked up at him from the teacher's desk; it was <PERSON>. 'This lesson began ten minutes ago, <PERSON>, so I think we'll make it ten points from Gryffindor. Sit down.' "
" 'D'you know what that --' (he called <PERSON> something that made <PERSON> say '<PERSON>!') '-- is making me do? I've got to scrub out the bedpans in the hospital wing. Without magic!' He was breathing deeply, his fists clenched. 'Why couldn't <PERSON> have hidden in <PERSON>'s office, eh? He could have finished him off for us!' <PERSON> woke extremely early the next morning; so early that it was till dark. For a moment he thought the roaring of the wind had woken him. Then he felt a cold breeze on the back of his neck and sat bolt upright -- <PERSON> the Poltergeist had been floating next to him, blowing hard in his ear."
So when <PERSON> was "sick" the first time, it was storming really hard outside, so the moon wouldn't have been visible. But, later in the book it says
"A cloud shifted. There were suddenly dim shadows on the ground. Their party was bathed in moonlight. <PERSON> collided with <PERSON>, <PERSON>, and <PERSON>, who had stopped abruptly. 624
<PERSON> froze. He flung out one arm to make <PERSON> and <PERSON> stop. <PERSON> could see <PERSON>'s silhouette. He had gone rigid. Then his limbs began to shake. 'Oh, my --" <PERSON> gasped. "He didn't take his potion tonight! He's not safe!" "Run," <PERSON> whispered. "Run. Now.' " It says that "A cloud shifted. There were suddenly dim shadows on the ground. Their party was bathed in moonlight." and "<PERSON> could see <PERSON>'s silhouette. He had gone rigid. Then his limbs began to shake." Meaning that it's direct moonlight that causes the transformation. So why did <PERSON> transform the first time, if it was stormy outside? 406