Hari Julian
Hari Julianadalah hitungan hari yang terus menerus sejak permulaan Periode Julian dan terutama digunakan olehpara astronom.
Angka Hari Julian(JDN) adalah bilangan bulat yang ditetapkan untuk keseluruhanhari mataharidalam hari Julian dihitung mulai dari siangwaktu Universal,di mana angka 0 hari Julian ditetapkan untuk hari terhitung pada siang tanggal 1 Januari4713 SM,kalender Julian proleptik(24 November 4714 SM, dalamkalender Gregorian proleptik),[1][2][3]suatu tanggal di mana tiga siklus multitahun mulai (yakni siklusIndiksi,Solar,danLunar) dan yang mendahului tanggal mana pun dalam catatan sejarah.[4]Sebagai contoh, angka hari Julian untuk hari yang dimulai pada 12.00UTpada 1 Januari 2000 adalah 2.451.545.[5]
Tanggal Julian(JD) dari saat mana pun adalah angka hari Julian untuk siang sebelumnya dalam Waktu Universal ditambah fraksi hari sejak saat itu. Tanggal Julian dinyatakan sebagai angka hari Julian dengan tambahan pecahan desimal.[6]Sebagai contoh, Tanggal Julian untuk 00.30.00.0 UT 1 Januari 2013 adalah 2.456.293,520833.[7]
Periode Julianadalah suatu intervalkronologisdari 7980 tahun; tahun 1 dari Periode Julian adalah 4713 SM.[8]Ini telah digunakan olehahli sejarahsejak pengenalannya tahun 1583 untuk mengkonversi antara berbagaikalender.Tahun kalender Julian 2024 adalah tahun 6737 dari Periode Julian sekarang. Periode Julian berikutnya mulai pada tahun 3268 M.
Lihat juga
[sunting|sunting sumber]Referensi
[sunting|sunting sumber]- ^Dershowitz & Reingold 2008, 15.
- ^Seidelman 2013, 15.
- ^"Astronomical Almanac Online" 2016, Glossary, s.v. Julian date. Various timescales may be used with Julian date, such asTerrestrial Time(TT) or Universal Time (UT); in precise work the timescale should be specified.
- ^Both of these dates are years of the Christian orCommon Era(which has no year 0 between 1 BC and AD 1). Astronomical calculations generally include a year 0, so these dates should be adjusted accordingly (i.e. the year 4713 BC becomesastronomical year number−4712, etc.). In this article, dates before October 15, 1582 are in the (possibly proleptic) Julian calendar and dates on or after October 15, 1582 are in the Gregorian calendar, unless otherwise labelled.
- ^McCarthy & Guinot 2013, 91–2
- ^"Resolution B1" 1997.
- ^US Naval Observatory 2005
- ^Astronomical Almanac for the year 2017p. B4, which states 2017 is year 6730 of the Julian Period.
Daftar pustaka
[sunting|sunting sumber]- Astronomical almanac for the year 2001.(2000). U.S. Nautical Almanac Office andHer Majesty's Nautical Almanac Office.ISBN 978-0-11-772843-1.
- Astronomical almanac for the year 2017.(2016). U.S. Naval Observatory andHer Majesty's Nautical Almanac Office.ISBN 978-0-7077-4166-6.
- Astronomical Almanac OnlineDiarsipkan2016-12-24 diWayback Machine.. (2016). U.S. Nautical Almanac Office and Her Majesty's Nautical Almanac Office.
- Chi, A. R. (December 1979)."A Grouped Binary Time Code for Telemetry and Space Application"Diarsipkan2020-07-30 diWayback Machine.(NASA Technical Memorandum 80606). Retrieved from NASA Technical Reports Server April 24, 2015.
- "CS 1063 Introduction to Programming: Explanation of Julian Day Number Calculation."Diarsipkan2020-12-03 diWayback Machine.(2011). Computer Science Department, University of Texas at San Antonio.
- Dershowitz, N.&Reingold, E. M.(2008).Calendrical CalculationsDiarsipkan2008-07-12 diWayback Machine.3rd ed. Cambridge University Press.ISBN 978-0-521-70238-6.
- Digital Equipment Corporation.Why is Wednesday, November 17, 1858, the base time for VAX/VMS?Diarsipkan2020-12-14 diWayback Machine.Modified Julian Day explanation
- Edwards, B B, Smith, John Pye and ben Uziel, Jonathan,The Popular Bible Educator,Vol. 1, Biblical Chronology. Explanation of Technicalities. John Cassell, London 1853.
- Furness, C. E. (1915).An introduction to the study of variable stars.Boston: Houghton-Mifflin. Vassar Semi-Centennial Series.
- HORIZONS SystemDiarsipkan2007-03-28 diWayback Machine.. (April 4, 2013). NASA.
- Ideler,Handbuch der mathematischen und technischen Chronologie,vol. 1, Berlin 1825, available at[1]Diarsipkan2023-08-15 diWayback Machine.(in German).
- Information Bulletin No. 81Diarsipkan2020-05-11 diWayback Machine.. (January 1998). International Astronomical Union.
- Julian Date ConverterDiarsipkan2007-10-06 diWayback Machine.(March 20, 2013). US Naval Observatory. Retrieved September 16, 2013.
- Kempler, Steve. (2011).Day of Year CalendarDiarsipkan2012-07-05 diWayback Machine.. Goddard Earth Sciences Data and Information Services Center.
- McCarthy, D.& Guinot, B. (2013). Time. In S. E. Urban & P. K. Seidelmann, eds.Explanatory Supplement to the Astronomical Almanac,3rd ed. (pp. 76–104). Mill Valley, Calif.: University Science Books.ISBN 978-1-891389-85-6
- Meeus Jean.Astronomical Algorithms(1998), 2nd ed,ISBN 0-943396-61-1
- Moyer, Gordon. (April 1981). "The Origin of the Julian Day System,"Sky and Telescope61311−313.
- Noerdlinger, P. (April 1995 revised May 1996).Metadata Issues in the EOSDIS Science Data Processing Tools for Time Transformations and GeolocationDiarsipkan2020-09-28 diWayback Machine.. NASAGoddard Space Flight Center.
- Ohms, B. G. (1986).Computer processing of dates outside the twentieth centuryDiarsipkan2016-01-01 diWayback Machine..IBM Systems Journal25, 244–251.doi:10.1147/sj.252.0244
- Ransom, D. H. Jr. (c. 1988)ASTROCLK Astronomical Clock and Celestial Tracking Programpages 69–143Diarsipkan2020-11-06 diWayback Machine., "Dates and the Gregorian calendar" pages 106–111. Retrieved September 10, 2009.
- "Resolution B1"Diarsipkan2020-08-26 diWayback Machine.. (1997).XXIIIrd General Assembly(Kyoto, Japan). International Astronomical Union, p. 7.
- Richards, E. G. (2013). Calendars. In S. E. Urban & P. K. Seidelmann, eds.Explanatory Supplement to the Astronomical Almanac,3rd ed. (pp. 585–624). Mill Valley, Calif.: University Science Books.ISBN 978-1-891389-85-6
- "SPD Toolkit Time Notes"Diarsipkan2020-05-11 diWayback Machine.. (July 21, 2014). InSPD Toolkit / HDF-EOSDiarsipkan2020-10-28 diWayback Machine.. NASA.
- Seidelmann, P. Kenneth (ed.) (1992).Explanatory Supplement to the Astronomical Almanacpages 55 & 603–606. University Science Books,ISBN 0-935702-68-7.
- Seidelmann, P. Kenneth. (2013). "Introduction to Positional Astronomy" in Sean Urban and P. Kenneth Seidelmann (eds.)Explanatory supplement to the Astronomical Almanac'(3rd ed.) pp. 1–44. Mill Valley, CA: University Science Books.ISBN 978-1-891389-85-6
- "SOFA Time Scale and Calendar ToolsDiarsipkan2023-03-21 diWayback Machine.".(2016 June 14). International Astronomical Union.
- Strous, L. (2007)Astronomy Answers: Julian Day Number.Diarsipkan2012-09-18 diWayback Machine.Astronomical Institute / Utrecht University.
- Tøndering, Claus. (2014)."The Julian Period"Diarsipkan2020-10-27 diWayback Machine.inFrequently Asked Questions about Calendars.author.
- US Naval Observatory. (2005, last updated July 2, 2011).Multiyear Interactive Computer Almanac 1800–2050(ver. 2.2.2). Richmond VA: Willmann-Bell,ISBN 0-943396-84-0.
- Winkler, M. R. (n. d.)."Modified Julian Date"Diarsipkan2013-02-14 diWayback Machine.. US Naval Observatory. Retrieved April 24, 2015.