Today, we take longitude for granted, but it powers virtually every aspect of modern life.
In 1884, the International Meridian Conference convened in Washington, D.C., to standardize time and navigation. They established the Prime Meridian (0° longitude) at the Royal Observatory in Greenwich, London. This decision was pragmatic; at the time, over two-thirds of the world's shipping already used Greenwich charts. meridian longitude
The IDL is where you magically lose or gain a day. Crossing it eastbound (e.g., from Japan to the US) means you repeat the same calendar day. Crossing it westbound means you skip a day. The line is not entirely straight—it zigzags around political borders to keep countries (like Kiribati or Samoa) on the same calendar day. Today, we take longitude for granted, but it
Every point on Earth has an address. We know latitude tells us how far north or south we are, but —the unsung hero of navigation—runs north-south, connecting the poles and splitting the planet into time zones. These vertical lines are called meridians , and one of them changed the world forever. This decision was pragmatic; at the time, over
of longitude roughly corresponds to a one-hour difference in local time. 4. Practical Applications of Meridian Longitude What is longitude? - NOAA's National Ocean Service