The Ohio-Indiana state line became the time zone line in 1927 (north of US Route 40) and 1935 (from US Route 40 to the Ohio River). It was at this time the dividing line between Eastern Time and Central Time was moved from the Pennsylvania-Ohio and West Virginia-Ohio state lines. All of Indiana was located in the Central Time Zone. Time zones were first adopted by the United States Congress with the Standard Time Act of 1918. However, some communities chose to observe Eastern Time. ![]() The Standard Time Act of 1918 placed Indiana in the Central Time Zone. Census Bureau), closer to the center of the Central Time Zone at the 90th meridian than the center of the Eastern Time Zone at the 75th meridian.ġ918–61. The state capital in Indianapolis lies at approximately the 86th meridian (U.S. On November 18, 1883, telegraph lines transmitted GMT to major cities, where each city was to adjust their official time to their proper zone. By 1883, the major railroads in the US agreed to coordinate their clocks and begin operating on "standard time" with four "time zones" established across the (then 38-state) nation, centered on the 75th, 90th, 105th, and 120th meridians west. With the emergence of the railroads, hundreds of miles could be traveled in a much shorter time, causing a train passenger to apparently experience several slight changes in time over the course of even a short rail trip. In Indiana, local mean time varied from GMT-5:39 in the east to GMT-5:52 in the west. Since the sun reaches "high noon" four minutes later for every degree of longitude traveled towards the west, the time in every town was different. The diagrams in this article are colored to show these 11 zones and a key is provided below.īefore 1883 in the United States, most towns and cities set their own local time to noon when the sun was at its highest point in the sky. The tz database lists 11 time zones for Indiana, where each zone is defined as a geographic area that observed the same offsets from UTC since Janu(the UNIX epoch). Shanks, where the author identifies 345 areas in the state with a different time zone history for each. The most extensive study of time zone history in Indiana has been published in The American Atlas (1978) by Thomas G. Since April 2, 2006, all counties in Indiana observe daylight saving time. Southwestern Indiana ( Evansville Metro Area):.Northwestern Indiana ( Chicago- Gary metropolitan area):.Six of these counties are in northwestern Indiana, near Chicago (which observes Central Time), and six are in southwestern Indiana, near Evansville, where the metro area includes portions of southeastern Illinois and western Kentucky, which also observe Central Time. Indiana observes Eastern Time, except for 12 of its 92 counties, which observe Central Time. Time in Indiana: Counties grouped by time zone.
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