首页 > Term: A1 time
A1 time
An atomic-time scale established by the U. S. Naval Observatory, with the origin on 1 January 1958 at zero hours UT2 and with the unit (second) equal to the occurrence of 9,192,631,770 cycles of cesium-generated radiation of specified wavelength at zero field.
- 词性: noun
- 行业/领域: 地球科学
- 类别 绘图科学
- Company: American Congress on Surveying & Mapping
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- Sean64
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