The Soviet Union once reduced its 11 time zones down to only 3 zones in 1930.

The Soviet Union was the largest country on Earth, stretching about 6,000 miles from east to west. This distance covers 150 degrees of longitude. Usually, the world is divided into time zones every 15 degrees to keep clocks aligned with the sun. In 1919, the country correctly used 11 different time zones.In 1930, the government implemented Decree Time. This plan merged the 11 zones into 3 massive blocks to simplify train schedules and factory shifts. They believed that having fewer time zones would help the government control the entire economy from Moscow. However, the sun does not move based on government rules.In eastern cities like Vladivostok, the sun did not rise until 10:00 AM because the clocks were set to match cities far to the west. Workers had to start their jobs in total darkness. This disrupted the human circadian rhythm, which is the internal body clock that responds to light and dark. People felt tired and confused because their bodies thought it was night while their clocks said it was day.The Trans-Siberian Railway faced major issues because train schedules did not match the actual daylight outside. International traders also found it difficult to schedule meetings because Soviet time did not match the rest of the world. The government finally realized the system did not work and returned to 11 time zones in 1957. Today, Russia still uses 11 time zones to keep clock time close to solar time.