2. The farming proverb 'counting the nines in winter' refers to dividing every nine days into a segment starting from the Winter Solstice, sequentially called the first nine, second nine, up to the ninth nine, with the Winter Solstice being the first day of the first nine. December 21, 2012, was the Winter Solstice, so February 10, 2013, is the $\qquad$th nine's $\qquad$th day.
Parse: $31-21+1+31+10=52,52 \div 9=5 \cdots 7,2013$ New Year's Day is the 7th day of the sixth nine-day period.