Historic

Both versions are correct.

It might be interesting and helpful for you to read this article :

http://grammartips.homestead.com/historical.html

Alex

A historic. Your sound the h so therefore it is a. If the h isn't sounded then we would say an to allow us to day the words (we don't pronounce vowel clusters in English). I think that most people pronounce the h so therefore a historic would be correct. If you said an historic you might come across as pompous and arrogant but not well educated.

Dave PhillipsIf you said an historic you might come across as pompous and arrogant but not well educated.

And if you use 'an' and pronounce the 'h' you're really off track.

Yes Philip that was covered by the fact that an is only said to prevent a vowel cluster.

The only way that is correct is "a historic." You use "an" in front of a word that is a vowel or sounds like a vowel. For example, you would say "an American" because American starts with an A. But it's confusing because you would also say "an hour" even though hour does not start with a vowel, but the H is silent. Let me know if this helps!