julian date wikipedia - EAS
- A Julian date is a count of the number of days that have elapsed since noon on January 1, 4137 BC. It’s calculated by adding up all the full days that have passed since that date, then adding any additional elapsed hours, minutes, and seconds in a decimal format.
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檢視所有 Wikipediahttps://en.wikipedia.org/wiki/Julian_dayAs stated above, the Julian date (JD) of any instant is the Julian day number for the preceding noon in Universal Time plus the fraction of the day since that instant. Ordinarily calculating the fractional portion of the JD is straightforward; the number of seconds that have elapsed in the day divided by the number … 查看更多內容
The Julian day is the continuous count of days since the beginning of the Julian period, and is used primarily by astronomers, and in software for easily calculating elapsed days between two events (e.g. … 查看更多內容
Julian Period
The Julian day number is based on the Julian Period proposed by Joseph Scaliger, a classical … 查看更多內容The Julian day number can be calculated using the following formulas (integer division rounding towards zero is used exclusively, that is, positive values are rounded down and negative values are rounded up):
The months … 查看更多內容The term Julian date may also refer, outside of astronomy, to the day-of-year number (more properly, the ordinal date) in the Gregorian calendar, especially in computer … 查看更多內容
Because the starting point or reference epoch is so long ago, numbers in the Julian day can be quite large and cumbersome. A more recent starting point is sometimes used, for instance by dropping the leading digits, in order to fit into limited … 查看更多內容
• Alsted, Johann Heinrich 1649 [1630]. Encyclopaedia (in Latin), Tome 4, Page 122.
• American Ephemeris and Nautical Almanac, Washington, 1855–1980, Hathi Trust 查看更多內容CC-BY-SA 授權下的維基百科文字儒略日 - 维基百科，自由的百科全书
https://zh.wikipedia.org/wiki/儒略日儒略日（Julian Day）是在儒略週期內以連續的日數計算時間的計時法，主要是天文學家在使用。
儒略日數（Julian Day Number，JDN）的計算是從格林威治標準時間的中午開始，包含一個整天的時間，起點的時間（0日）回溯至儒略曆的西元前4713年1月1日中午12點（曾在格里曆是西元前4714年11月24日） ，這個日期是三種多年週期的共同起點，且是歷史上最接近現代的一個起點 。例如，2000年1月1日的UT12:00是儒略日2,451,545 。Wikipedia · CC-BY-SA 授權下的文字- 預估閱讀時間: 10 分鐘
- https://en.wikipedia.org/wiki/Julian_Calendar
網頁The Julian calendar, proposed by Roman consul Julius Caesar in 46 BC, was a reform of the Roman calendar. [1] It took effect on 1 January 45 BC, by edict. It was designed with …
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- https://en.wikipedia.org/wiki/Julian_(emperor)
網頁Julian [i] ( Latin: Flavius Claudius Julianus; Greek: Ἰουλιανός Iulianos; 331 – 26 June 363) was Roman emperor from 361 to 363, as well as a notable philosopher and author in …
- Father: Julius Constantius
- https://simple.wikipedia.org/wiki/Julian_calendar
網頁Julian calendar - Simple English Wikipedia, the free encyclopedia Jump to content Search Create account Personal tools Create account Log in Pages for logged out editors learn …
- Ab urbe condita: 2775
- Assyrian calendar: 6772
- Armenian calendar: 1471, ԹՎ ՌՆՀԱ
- Gregorian calendar: 2022, MMXXII
- https://en.wikipedia.org/wiki/Barycentric_Julian_Date
網頁The Barycentric Julian Date (BJD) is the Julian Date (JD) corrected for differences in the Earth 's position with respect to the barycentre of the Solar System. Due to the finite …
- https://en.wikipedia.org/wiki/Julian_year_(astronomy)
網頁The Julian day number is a simplified time-keeping system originally intended to ease calculation with historical dates which involve a diversity of local, idiosyncratic calendars. …
- https://de.wikipedia.org/wiki/Julianisches_Datum
網頁Das julianische Datum (abgekürzt in allen Sprachen [1] [2] JD für englisch Julian Date) ist eine in den Naturwissenschaften, besonders der Astronomie, gebräuchliche, von der IAU …
- https://www.wikihow.com/Read-Julian-Dates
網頁2021/9/15 · Julian dates (JD) are a continuous count of days since noon Universal Time on January 1, 4713 BC. Astronomers often use Julian dates as a standardized form of …
- https://www.typecalendar.com/julian-date
網頁The Julian Date, abbreviated as JT, is the date determined by these numbers. The Julian Date of any date can be found in 2 ways: The charts in the astronomy annals are …
