Cloud Nine

Yday I looked up the definition of "cloud nine" to make sure I was using it correctly. (I wanted to use it to explain my state since dating and to offer an explanation why I'm not on top of event dates). I ended up using "head in the clouds" instead, which is probably more correct. Just now I saw on NY Times that it was used at the end of an article that caught my eye, about a huge mass wedding in Taiwan because of the auspicious date, the number 9 meaning "longevity."