Historic or historical? There are several adjectives like this in English with two forms, one ending -ic and the other -ical. The reason is that they express different meanings, and generally speaking the -ical form expresses the ordinary sense associated with the root word, whereas the -ic form expresses a special meaning. A historical event or person is simply something that happened or somebody who lived in the past, so they form part of history.

A historic event means something really significant that possibly "changed the course of history", a truly memorable event. "Geographical" means something or someone involved in the study and description of the world, but "geographic" means "about geography itself", in particular the magazine National Geographic. "Economical" (Slovak "úsporný") looks like a special meaning, but in fact it's closer to the original Greek sense of (efficient) housekeeping, i.e. "hospodárenie", so it means "hospodárny". "Economic" is more modern, meaning something linked to the national economy ("hospodárstvo"), so it's "hospodársky".