Both "a historical" and "an historical" are used, but the article "a" is far more common, particularly in American English.
Both "a historical" and "an historical" are used, but the article "a" is far more common, particularly in American English.
The paper takes a/an historical approach to economic policy.
Remember, choosing between "a" and "an" is determined by the sound of the initial letter of the following word rather than the letter itself.
It's a great city with a/an historical center, monuments, and museums.
Source: Google Books Ngram Viewer
Follow the same practice with the words historic and historically.
It is a/an historically accurate depiction of the French Revolution.
