The 1st meridian east, also known as the prime meridian or the Greenwich meridian, is a line of longitude that is situated at 1 degree east of the prime meridian, which is at 0 degrees longitude. The prime meridian itself runs through Greenwich, London, and serves as the reference point for measuring longitude. In geographical terms, the 1st meridian east is used to denote a location that is located 1 degree east of this reference point.
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