| 单词 | greenwich meridian |
| 释义 | > as lemmasGreenwich meridian Greenwich meridian n. the prime meridian passing through Greenwich.The meridian through the Royal Observatory at Greenwich was adopted as the prime meridian of the world at an international conference in 1884 (cf. quot. 1884 for prime meridian n. at prime adj. and adv. Compounds). It passed through the transit circle built by Sir George Airy at the observatory in 1851, and was marked on the ground by a metal strip. With the advent of modern geodetic reference systems, the original meridian was replaced in the 1980s by one based on an internationally agreed spheroid and situated about 336 feet (102 m, 5.3 seconds of arc) east of this.extracted from Greenwichn.< as lemmas |
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