Chanukah laining???

Why is it that on Chanukah in America (Chutz Laaretz) we lain that day of Chanukah, broken into two aliyos, and the next day, so that we have three aliyos, and in Eretz Yisrael we lain that day of Chanukah three times? The answer is not Sfeika D'Yoma, does anybody have any idea what IS the answer???