2. (6 points) The agricultural proverb 'counting the nines in winter' refers to the practice of dividing every nine days into a segment starting from the Winter Solstice, sequentially called the first nine, second nine, ... 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.
【Analysis】First, calculate the number of days from December 21, 2012, to February 10, 2013, then determine how many 9-day periods are in these days, and how many days are left over. Finally, use the remainder to determine which day of which 9-day period it is.

【Solution】Solution: From December 21, 2012, to February 10, 2013, including New Year's Day, there are $11+31+10=52$ days,
$$
52 \div 9=5 \cdots 7,
$$

which means 5 full 9-day periods have passed, with 7 days remaining. This day is the 7th day of the 6th 9-day period.
Answer: February 10, 2013, is the 7th day of the 6th 9-day period.
Therefore, the answer is: six, 7.