what is this line at greenwich|‘Hello’ from zero degrees longitude

‘Hello’ from zero degrees longitude This laser projected from the Royal Observatory in Greenwich marks the prime meridian, dividing Earth’s Eastern and Western Hemispheres and helping travellers to chart their courses by establishing a universally adopted 0 degrees longitude. The meridian itself is essentially an imaginary line, arbitrarily placed. By the early 19th century, most maritime countries had established their own prime meridians to aid in navigation. But on this date in 1884, delegates from 25 nations met at a conference in Washington, DC, where they established Greenwich as the international standard for mapping and timekeeping. The decision made sense, as the Greenwich meridian was already widely used. However, France abstained from the vote and used its own prime meridian for several decades before eventually joining other countries in recognising the Greenwich meridian.The Greenwich Meridian separates east from west in the same way that the Equator separates north from south. Inextricably linked with Greenwich Mean Time, it also sits at the centre of our system of time zones. Its path is determined by the location of an historic telescope, the Airy Transit Circle, which is housed at the Royal Observatory, Greenwich. Such is the Meridian's fame that each year, hundreds of thousands of visitors from all around the world make their way to the Observatory to stand astride the Line. But its position is marked in hundreds of other places too. On its path from pole to pole, the Meridian passes through England, France, Spain, Algeria, Mali, Burkina Faso, Togo, Ghana and Antarctica. thanks for watching subscribe my channel

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