Because some countries, islands and states do not want to be divided into several zones, the zones' boundaries tend to wander considerably from straight north-south lines.

The international dateline was drawn to generally follow the 180 meridian in the Pacific Ocean. The 24 standard meridians, every 15 east and west of 0 at Greenwich, England, were designated the centers of the zones. C., applied the same procedure to zones all around the world. On November 1, 1884, the International Meridian Conference in Washington, D. At noon, on November 18, 1883, telegraph lines transmitted GMT time to major cities where authorities adjusted their clocks to their zone's proper time. View United States country map, street, road and directions map as well as satellite tourist map. That year, the United States was divided into four time zones roughly centered on the 75th, 90th, 105th, and 120th meridians. Current Local Time in the United States Multiple Time Zones See map below for details Time Zones in USA 4:11 am Honolulu HST UTC -10. Until 1883 most railway companies relied on some 100 different, but consistent, time zones. World Time Zone Map Time Zone Globes Time Zone Abbreviations Not Responsible For Errors WE RESPECT YOUR PRIVACY. The problem of keeping track of over 300 local times was overcome by establishing railroad time zones. Each time zone shows current time in that area (colour-coded) Alaska 3:28 AM Hawaii 1:28 AM Pacific 4:28 AM Mountain 5:28 AM Central 6:28 AM Eastern 7:28 AM. Until the 1860s most cities relied upon their own local “sun” time, but this time changed by approximately one minute for every 12 miles traveled east or west. The Office of Coast Survey depicts on its nautical charts the territorial sea (12 nautical miles. baseline, recognized as the low-water line along the coast as marked on the NOAA nautical charts in accordance with the articles of the Law of the Sea. Time zones did not become necessary in the United States until trains made it possible to travel hundreds of miles in a day. Maritime limits and boundaries for the United States are measured from the official U.S. Source: National Institute of Standards and Technology Physics Laboratory

Time zone map united states