Anonymous
Anonymous asked in 社會與文化語言 · 1 decade ago

幫忙翻譯Julian Day賺20點

Julian DayAstronomers, unlike historians, frequently need to do arithmetic with dates. For example: a double star goes into eclipse every 1583.6 days and its last mid-eclipse was measured to be on October 17, 2003 at 21:17 UTC. When is the next? Well, you could get out your calendar and count days, but it's far easier to convert all the quantities in question to Julian day numbers and simply add or subtract. Julian days simply enumerate the days and fraction which have elapsed since the start of the Julian era, which is defined as beginning at noon on Monday, 1st January of year 4713 B.C.E. in the Julian calendar. This date is defined in terms of a cycle of years, but has the additional advantage that all known historical astronomical observations bear positive Julian day numbers, and periods can be determined and events extrapolated by simple addition and subtraction. Julian dates are a tad eccentric in starting at noon, but then so are astronomers (and systems programmers!)--when you've become accustomed to rising after the "crack of noon" and doing most of your work when the Sun is down, you appreciate recording your results in a calendar where the date doesn't change in the middle of your workday. But even the Julian day convention bears witness to the eurocentrism of 19th century astronomy--noon at Greenwich is midnight on the other side of the world. But the Julian day notation is so deeply embedded in astronomy that it is unlikely to be displaced at any time in the foreseeable future. It is an ideal system for storing dates in computer programs, free of cultural bias and discontinuities at various dates, and can be readily transformed into other calendar systems, as the source code for this page illustrates. Use Julian days and fractions (stored in 64 bit or longer floating point numbers) in your programs, and be ready for Y10K, Y100K, and Y1MM!

Update:

大家不要用線上的翻譯軟體...

因為那個翻譯起來上下文會很奇怪

所以如果用線上翻譯軟體拜託check一下

讓上下文順暢

4 Answers

Rating
  • Anonymous
    1 decade ago
    Best Answer

    朱利安日(凱撒日)

    天文學家並不像歷史學家,他們(天文學家)必需要對於日期斤斤計較。舉例來說,某個雙星(請參考解說一)每隔1583.6天進行一次日蝕,而它的日偏蝕是在2003年的10月17日世界時間晚上9點17分時發生,那它下一次發生的時期為何? 當然,你可以自己拿起日曆一天天慢慢算,但是你可以採用簡單的方式,利用朱利安數值將天數轉換,並利用加減的方式輕鬆的算出日期。利用朱利安數值計算方式,可以輕易的估計出在自〝朱利安年(年週期)〞中日蝕的所需時日及剩餘時間,其朱利安年於西元前4713年的一月一日,星期一中午開始。這個日子就朱利安曆法而言指的是一年的循環,但是這個額外的優點在於,歷史上重大天文紀事的朱利安數值都是正值(意思是說從那一天開始之後的日子,所算出來的朱利安值都是正的,而不是負的),而週期的估計及事件的預測都可以以簡單的加法或是減法來估算出來。朱利安日很反常的是以月亮的盈缺起始來估算,但天文學家也是一樣(程式設計師也一樣)<---我知道這一句翻的很怪,但我也不知道該怎麼翻才好

    當你習慣於中午以後起床,並在太陽下山後開始工作,你會很慶幸當你將工作結果記錄在月曆中時,會發現在你的工作天數裡,你的日期並沒有改變。朱利安曆法見證了19世紀的歐洲天文學 – 在世界的另一頭的中午,在格林威治當地卻是半夜。朱利安曆法在天文學上已經被廣泛運用,且在未來預知日子裡也不會被淘汰。對儲存電腦程式中的日期而言,這是一套完美的系統,它沒有任何的文化上的偏頗,也不會因為日子的不同就出現中斷,它也可以輕鬆的轉換到另一套系統上,並且可以成為此頁數標記的來源碼。使用朱利安曆法及分數(儲存64位元或是更長的浮點計算數字),你再也不用害怕下一個Y10K, Y100K以及Y1MM。Y10K這一段英文的意思是指下一個千囍年)

    解說一:Double Star是指〝雙星〞,意思是指以地球的角度來看是同一顆星體,但實際上兩顆星體離的很遠,只是一前一後,讓人覺得像是只有一顆星球罷了

  • Anonymous
    5 years ago

    到下面的網址看看吧

    ▶▶http://qoozoo09260.pixnet.net/blog

  • Anonymous
    1 decade ago

    Julian Day 在天文上一般都翻成儒略日

  • Anonymous
    1 decade ago

    朱利安日子

    天文學家,不像歷史學家,時常需要對日期做算術。 舉例來說:一個兩倍的星每 1583.6 天進入日蝕和它的最後中部-日蝕 2003 年十月 17 日被測量到是在 21:17 UTC。 下一個是何時? 好吧,你可以每天逃跑你的日曆和計數,但是將在問題的所有的量轉換成朱利安日子數字並且只是增加或者減去是更為容易。朱利安每天只是列舉那每天和自從七月的開始以後已經過去的分數

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