The prime meridian, which passes through the Royal Observatory at Greenwich in London. It was adopted internationally as the zero of longitude in 1884.
格林尼治子午线（本初子午线，穿过原位于格林尼治的英国皇家天文台，1884年在国际上被定为0度经线）
Example sentencesExamples
It lies 102 ½ metres further east than the official Greenwich meridian and is the line used for all air and sea navigation.
By international convention, it passes through the original site of the Royal Observatory in Greenwich, England; for this reason, it is sometimes called the Greenwich meridian.
I stop just outside the front door, and am rather pleased to discover that I live exactly 0°1'2 ‘west of the Greenwich meridian.’
Accurate measurements from space have led to another slight shift of the globe's most important line, and the GPS meridian now lies 102.48 metres east of the old Greenwich meridian.
Here the zero lines of longitude and latitude - the Greenwich meridian and the equator - bisect.
Definition of Greenwich meridian in US English:
Greenwich meridian
noun
The prime meridian, which passes through the Royal Observatory at Greenwich, England, adopted internationally as the earth's zero of longitude in 1884.
格林尼治子午线（本初子午线，穿过原位于格林尼治的英国皇家天文台，1884年在国际上被定为0度经线）
Example sentencesExamples
I stop just outside the front door, and am rather pleased to discover that I live exactly 0°1'2 ‘west of the Greenwich meridian.’
Here the zero lines of longitude and latitude - the Greenwich meridian and the equator - bisect.
Accurate measurements from space have led to another slight shift of the globe's most important line, and the GPS meridian now lies 102.48 metres east of the old Greenwich meridian.
By international convention, it passes through the original site of the Royal Observatory in Greenwich, England; for this reason, it is sometimes called the Greenwich meridian.
It lies 102 ½ metres further east than the official Greenwich meridian and is the line used for all air and sea navigation.