science · 13 October 1884 · 140 years ago
In 1884, Greenwich was adopted as the universal meridian. At the behest of the U.S. President, 41 delegates from 25 nations met in Washington, DC, for the International Meridian Conference. At the Conference several important principles were established: a single world meridian passing through the principal Transit Instrument at the Observatory at Greenwich; that all longitude would be calculated both east and west from this meridian up to 180°; a universal day; and studies of the decimal system to the division of time and space. Resolution 2, fixing the Meridian at Greenwich was passed 22-1 (San Domingo voted against, France & Brazil abstained). Greenwich lies on the River Thames, a few miles from central London.
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