Since there are two "third quarters" included in the second case, it actually represents three months more than one year.
I have a word problem that is asking me for the amount of sales for the past year starting from 3Q09.
With that being said would the past year from 3q09 look like this:
This example has 4 quarters which = one year
This example has 5 quarters but its from 3q09 to 3q08 which is also a year.