Historic vs. Historical
I ran across this tidbit at a party (yes, we editors do go to parties). A book editor friend of mine was excited to tell me about her latest discovery.
"Historical: adj. 1 a : of, relating to, or having the character of history historical data> b : based on history historical novels> c : used in the past and reproduced in historical presentations.
Historic: adj. a : famous or important in history historic battlefields> b : having great and lasting importance historic occasion>."
That is all to say, that anything in the past is historical, but only important or famous historical events are historic.
The assassination of Abraham Lincoln was an historic event.
The Historical Society of Seattle preserves information about the history of Seattle (historic or not) in its archives.