↑ 海水のせいで自転が遅くなってるんじゃなかったのか！
月が遠ざかる理由が （これに関係してる、というのが） ワカラン！！！ｗｗｗ
one group of researchers estimates that 1.4 billion years ago a day was just 18.7 hours. At that time, the moon was likely some 27,000 miles closer to Earth than it is now, they say.