Exact eastern standard time

Of course, everyone knows what time zone they are in. However, how much do you know about time zone differences, and how did scientists come up with time zones in the first place?

Places that use:. On the second Sunday in March, at a. EST, clocks are advanced to a. EDT leaving a one-hour gap. On the first Sunday in November, at a. EDT, clocks are moved back to a.

Exact eastern standard time

In the United States, time is divided into nine standard time zones covering the states, territories and other US possessions, with most of the country observing daylight saving time DST for approximately the spring, summer, and fall months. The time zone boundaries and DST observance are regulated by the Department of Transportation , but no single map of those existed until the agency announced intentions to make one in September The clocks run by these services are kept synchronized with each other as well as with those of other international timekeeping organizations. It is the combination of the time zone and daylight saving rules, along with the timekeeping services, which determines the legal civil time for any U. Before the adoption of four standard time zones for the continental United States, many towns and cities set their clocks to noon when the sun passed their local meridian , pre-corrected for the equation of time on the date of observation, to form local mean solar time. Noon occurred at different times but time differences between distant locations were barely noticeable prior to the 19th century because of long travel times and the lack of long-distance instant communications prior to the development of the telegraph. The use of local solar time became increasingly awkward as railways and telecommunications improved. Each train station set its own clock making it difficult to coordinate train schedules and confusing passengers. Time calculation became a serious problem for people traveling by train sometimes hundreds of miles in a day , according to the Library of Congress. Train drivers must recalculate their own clocks in order to know departure time. Every city in the United States used a different time standard so there were more than local sun times to choose from. Time zones were therefore a compromise, relaxing the complex geographic dependence while still allowing local time to be approximate with mean solar time. Railroad managers tried to address the problem by establishing railroad time zones, but this was only a partial solution to the problem.

This point is known as the Greenwich Meridian or Prime Meridian.

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Sounds crazy, right? However, time zones have been created for a wide variety of social, legal, and commercial reasons. To keep track of time around the planet, countries adhere to certain time zones. Truth be told, it is very helpful for countries and people who do business together and who conduct all sorts of other activities together to keep the same time. Because of this fact, time zones usually follow the boundaries of countries or regions although there are curious exceptions to this.

Exact eastern standard time

The Time Now is a reliable tool when traveling, calling or researching. This time zone is reckoned 75 degrees west of the Greenwich and it encompasses most of the eastern parts of the United States. It is also the timezone used in Canada , the Caribbean, and in a few countries of South America. All places using it are five hours before the universal time, UTC

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Guam , Northern Mariana Islands. EDT on the second Sunday in March, and return from a. Download as PDF Printable version. EST, which results in one hour being duplicated. Four standard time zones for the continental United States were introduced at noon on November 18, , in Chicago, IL , when the telegraph lines transmitted time signals to all major cities. The time zone boundaries and DST observance are regulated by the Department of Transportation , but no single map of those existed until the agency announced intentions to make one in September Not defined by 15 U. They greatly influence social and commercial activity and have an influence over military communications and operations. Most of Canada observes daylight saving time synchronously with the United States, with the exception of Saskatchewan , Yukon , [8] and several other very localized areas. The clocks run by these services are kept synchronized with each other as well as with those of other international timekeeping organizations. In Canada, daylight saving time begins and ends on the same days and at the same times as it does in the United States. So, if your country or the destination country is in the process of observing daylight time and you want to convert Eastern Daylight Time to other time zones, pay attention to the list below:. Louisville magazine. Read Edit View history. Marquis Company.

In the Northern Hemisphere, spring starts in March; south of the equator, it begins in September.

There is no difference in time between New York and Cuba! March 4, Virgin Islands. From east to west, the four time zones of the contiguous United States are:. TAI is a scale that helps determine the speed at which clocks should tick. And contrary to what is generally believed, UTC is not a time zone. Main article: Time in Mexico. EDT leaving a one-hour gap. Curious fact: it is important to note that these countries and cities are not in the EDT time zone all year round, because some of them observe Daylight Saving Time, which means they enter another time zone during the summer months. Web Exhibit. Time in the United States. The following locations observe Eastern Time:. Four standard time zones for the continental United States were introduced at noon on November 18, , in Chicago, IL , when the telegraph lines transmitted time signals to all major cities. Retrieved September 21, Contents move to sidebar hide.