Key points More than 100 years ago, the United States was already divided into major time zones, a system introduced to make ...

Indiana started the 20th century entirely on Central Time. Today 80 of its 92 counties are on Eastern. Here’s how the map ...

Dark mornings take hold of the entire county in winter, but Louisville has more time without sunlight than other cities due to a significant time zone change in 1961. That year, the Interstate ...