Thank you Grammar Geek for your compliment, I am glad to be here with you sharing and learning. In fact I have also meant what you said.
![Smile [:)]](/emoticons/emotion-1.gif)
If the pronunciation starts with a consonant sound then it takes "a", as in "university". Besides, as in "hour", the pronunciation starts with a vowel, and it takes "an". I think we agree on the same idea.
![Smile [:)]](/emoticons/emotion-1.gif)
I hope I could make myself clear enough