Lihat sumber Hari Julian

'''Hari Julian''' adalah hitungan hari yang terus menerus sejak permulaan Periode Julian dan terutama digunakan oleh [[Astronomi|para astronom]].

'''Angka Hari Julian''' ('''JDN''') adalah bilangan bulat yang ditetapkan untuk keseluruhan [[waktu matahari|hari matahari]] dalam hari Julian dihitung mulai dari siang [[waktu Universal]], di mana angka 0 hari Julian ditetapkan untuk hari terhitung pada siang tanggal 1 Januari [[Milenium ke-5 SM|4713&nbsp;SM]], [[kalender Julius proleptik|kalender Julian proleptik]] (24 November 4714&nbsp;SM, dalam [[kalender Gregorian proleptik]]), suatu tanggal di mana tiga siklus multitahun mulai (yakni siklus [[Indiksi]], [[siklus solar (kalender)|Solar]], dan [[siklus Metonik|Lunar]]) dan yang mendahului tanggal mana pun dalam catatan sejarah. Sebagai contoh, angka hari Julian untuk hari yang dimulai pada 12.00 [[Waktu Universal|UT]] pada 1 Januari 2000 adalah 2.451.545.

'''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. Sebagai contoh, Tanggal Julian untuk 00.30.00.0 UT 1 Januari 2013 adalah 2.456.293,520833.

'''Periode Julian''' adalah suatu interval [[kronologi]]s dari 7980 tahun; tahun 1 dari Periode Julian adalah 4713&nbsp;SM. Ini telah digunakan oleh [[Sejarah|ahli sejarah]] sejak pengenalannya tahun 1583 untuk mengkonversi antara berbagai [[kalender]]. Tahun kalender Julian  adalah tahun  dari Periode Julian sekarang. Periode Julian berikutnya mulai pada tahun 3268&nbsp;M.

== Lihat juga ==
* [[Tahun Julian]]
* [[Kalender Julian]]
* [[Epos (astronomi)]]
* [[Waktu]]
* [[Waktu standar]]
* [[Milenium ke-5 SM]]

== Referensi ==


== Daftar pustaka ==
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== Sumber dan atribusi ==

Konten artikel ini diadaptasi dari [https://id.wikipedia.org/w/index.php?title=Hari+Julian&oldid=29506518 Wikipedia bahasa Indonesia], revisi 29506518 (2026-07-30T07:28:43Z), yang tersedia berdasarkan lisensi Creative Commons Atribusi-BerbagiSerupa (CC BY-SA). Mohon gunakan konten ini secara bijak serta sesuai dengan ketentuan lisensi yang berlaku.