格林尼治时间或被原子时取代
<p>格林尼治时间以英国首都伦敦市郊格林尼治天文台命名，作为全球通用的时间参考标准已使用120多年。如今，这一以地球自转为依据的“世界时”可能由以原子振荡周期为依据的“原子时”彻底取代。上世纪70年代一项国际协议确定世界时和原子时两种时间计量系统。世界时受地球自转速度减缓影响，有一定误差；原子时用原子能级跃迁振动频率计时，1000万年误差1秒，相对精准。一些研究人员呼吁废除时间计量系统的“双轨制”，以原子时作为单一计时标准。50多名研究人员11月3日至4日在伦敦市郊开会，讨论相关议题。国际电信联盟定于明年1月在瑞士日内瓦表决是否以原子时替代世界时。不过，这一提议无疑会伤害英国人的“国家自豪感”。英国有官员表示，我们应该以地球自转为依据，依照人们所感知的真实时间来计时。</p><p><span word="For">For</span> <span word="more">more</span> <span word="than">than</span> 120 <span word="years">years</span>, <span word="Greenwich">Greenwich</span> <span word="Mean">Mean</span> <span word="Time">Time</span> (<span word="GMT">GMT</span>) <span word="has">has</span> <span word="been">been</span> <span word="the">the</span> <span word="international">international</span> <span word="standard">standard</span> <span word="for">for</span> <span word="timekeeping">timekeeping</span>, <span word="but">but</span> <span word="it">it</span> <span word="is">is</span> <span word="now">now</span> <span word="under">under</span> <span word="threat">threat</span> <span word="from">from</span> <span word="a">a</span> <span word="new">new</span> <span word="definition">definition</span> <span word="of">of</span> <span word="time">time</span> <span word="itself">itself</span> <span word="based">based</span> <span word="not">not</span> <span word="on">on</span> <span word="the">the</span> <span word="rotation">rotation</span> <span word="of">of</span> <span word="the">the</span> <span word="Earth">Earth</span>, <span word="but">but</span> <span word="on">on</span> <span word="atomic">atomic</span> <span word="clocks">clocks</span>.</p><p><span word="In">In</span> <span word="January">January</span> <span word="the">the</span> <span word="International">International</span> <span word="Telecommunication">Telecommunication</span> <span word="Union">Union</span> <span word="will">will</span> <span word="meet">meet</span> <span word="in">in</span> <span word="Geneva">Geneva</span> <span word="to">to</span> <span word="vote">vote</span> <span word="on">on</span> <span word="whether">whether</span> <span word="to">to</span> <span word="adopt">adopt</span> <span word="the">the</span> <span word="new">new</span> <span word="measure">measure</span>, <span word="despite">despite</span> <span word="protests">protests</span> <span word="from">from</span> <span word="Britain">Britain</span>.</p><p><span word="The">The</span> <span word="two">two</span>-<span word="day">day</span> <span word="meeting">meeting</span> <span word="of">of</span> <span word="about">about</span> 50 <span word="experts">experts</span> <span word="at">at</span> <span word="a">a</span> <span word="country">country</span> <span word="house">house</span> <span word="north">north</span>-<span word="west">west</span> <span word="of">of</span> <span word="London">London</span>, <span word="under">under</span> <span word="the">the</span> <span word="aegis">aegis</span> <span word="of">of</span> <span word="the">the</span> <span word="prestigious">prestigious</span> <span word="Royal">Royal</span> <span word="Society">Society</span>, <span word="on">on</span> <span word="Thursday">Thursday</span> <span word="and">and</span> <span word="Friday">Friday</span> <span word="will">will</span> <span word="look">look</span> <span word="at">at</span> <span word="some">some</span> <span word="of">of</span> <span word="the">the</span> <span word="issues">issues</span> <span word="involved">involved</span>.</p>
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