1)
Why does it say "ha'Sheni ba'Sheni"?
1.
'Rashi': Because it mentioned the fourth year of his kingship, it needed to repeat "ba'Sheni". This is like "veha'Mayim Hayu Haloch v'Chasor Ad ha'Chodesh ha'Asiri [ba'Asiri]" (Bereishis 8:5), and "ba'Shanah ha'Revi'is b'Chodesh Ziv Hu ha'Chodesh ha'Sheni" (Melachim I, 6:1).
2.
Radak: It was Monday.
3.
Radak (citing Yerushalmi Rosh Hashanah 2:1), Malbim: A Hekesh teaches that just like it was the second month of the year, it was the second month of his fourth year of kingship, i.e. we count years of kingship from Nisan. (PF)
2)
Why did Shlomo begin in the second month?
