In 1884, the International Meridian Conference agreed that GMT was going to be the benchmark for all time zones around the world. The first public declaration of Greenwich Mean Time, or GMT, was made in 1833. It was decided that the mean time-in other words, the time after correcting for changes in the apparent lengths of days caused by the Earth’s rotation around the sun-in Greenwich at the prime meridian was going to be the standard. Up until then, towns and regions were able to set their own time as they saw fit. The UK was in need of a standard time to keep the trains running on schedule. The prime meridian is the longitude (line stretching north to south) that is considered the anchor or central point of a map, labeled 0⁰.įast forward to the 1800s. In 1721, the Royal Observatory began to use Greenwich as the location for the UK’s prime meridian in map making and navigation systems. That’s when the Royal Observatory in Greenwich (pronounced ) was commissioned by King Charles II for the purpose of studying cartography, geography, meteorology, and related subjects (including time). To understand how we ended up with the time zones we are familiar with today, we need to go all the way back to 1675. But how were these time zones decided upon? Who declared Greenwich Mean Time (GMT)? Within a time zone, everyone has the same time. Time zones were first established in the UK and elsewhere in the mid-1800s, largely in response to new communication methods such as the telegraph, and new steam engines on trains and boats that accelerated travel. S tandard refers to the fact that it is the official time in that area. First of all, what is a time zone?Ī time zone is a geographic area, typically 15⁰ longitude wide, that shares the same standard time. Let’s synchronize our watches and cover some of the key lingo related to time zones. Amazing!īut, even though we don’t need to pay as much attention to time zones these days, that doesn’t mean they don’t still impact our lives. Another benefit of this technology? The clock on our smartphone automatically changes when we enter a new time zone. We all have clocks in our pockets-our smartphones. r/gifsthatendtoosoon NEW: Please post gifs that end too soon in that sub, instead of here.No one truly needs a watch these days.
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#Indiana time zone map license#
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