historic decision - for example, In a historic decision of 1964 (Reyn olds v. Sims), the Supreme Court held that all state legislators must be elected from districts of roughly equal population thus ensuring equal representation for all voters.
historic event - for example, For mankind, the Apollo 11 flight was indeed an historic event.
historic place - for example, Gettysburg is a historic place for those who want to trace the steps of a Civil War soldier on the battlefield.
historical - existing or happening in the past, whether regarded as important or not
historical monument - a building of historical importance, erected in the past, and regarded as prieceless treasure; historical heritage
historical costumes - costumes used in the past
historical novel - a novel dealing with real or imaginary events in the past
There is no difference in meaning between historic times and historical times.
That's all I was able to find and provide you with.
Bear in mind I'm not a teacher!