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From this line, we measure 180 degrees east and 180 degrees west. These two halves meet at the , which serves as the basis for the International Date Line. Crossing this invisible line changes not just the hour, but the actual day. meridian longitude
The breakthrough came from John Harrison, an English clockmaker, who invented the —a clock so accurate that sailors could compare ship time with Greenwich time to calculate longitude. It saved countless lives and made global sea travel reliable. For further learning, explore the following resources: From
meridian generally marks the International Date Line in the Pacific Ocean. 3. The Prime Meridian and the Universal Day The breakthrough came from John Harrison, an English
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.