karkauskaudet
Karkauskaudet, or leap seasons, are not a standard astronomical or calendrical term. It is possible this term is a misinterpretation or a very localized or informal name for a specific period or phenomenon. In standard calendrical systems, the concept of adding extra time to synchronize with the Earth's orbit around the sun is known as a leap year, which includes a leap day. This occurs approximately every four years to account for the fact that the Earth takes about 365.2422 days to orbit the sun.
If "karkauskaudet" refers to the period surrounding a leap day, it would simply be the days immediately