PENENTUAN HARI LIBUR NASIONAL UMAT KRISTEN DI INDONESIA MENGGUNAKAN ALGORITMA ASTRONOMI MEEUS

Abstract

Astronomically, Easter falls on the first Sunday following the first full moon after the vernal equinox. In Indonesia, Christian holidays including Easter are regulated by the Ministry of Religious Affairs based on the recommendation of Indonesian Church Union (PGI) and Bishops Conference of Indonesia (KWI). This study objective is to formulate a simple time marker by using Meeus Astronomical Algorithm to determine Christian holidays in Indonesian Gregorian calendar. Another objective is to evaluate the Christian holidays on Indonesian calendar between 1960 and 2015. Finally, this study would also provide prediction for future Christian holidays. This study finds out that the Christian holidays on Indonesian calendar are proven as methodologically accurate. It indicates that Meeus Astronomical Algorithm can produce accurate calculation for determining Christian holidays in Indonesia in the future. KEY WORDS:Meeus astronomical algorithm, christian holidays, Indonesian calendarSecara astronomis, perayaan Paskah jatuh pada hari Minggu pertama setelah bulan purnama pertama, setelah Matahari melalui Vernal Equinox. Di Indonesia tanggal libur keagamaan umat Kristen ditentukan oleh Kementerian Agama atas rekomendasi Persekutuan Gereja di Indonesia (PGI) dan Konferensi Wali Gereja Indonesia (KWI). Kajian ini bertujuan membuat program tanda waktu sederhana berdasarkan Algoritma Meeus untuk menentukan hari libur nasional umat Kristen di Indonesia pada kalender masehi, juga untuk evaluasi data hari libur umat Kristen dalam sejarah kalender Indonesia yang tercatat pada tahun 1960 hingga 2015 serta prakiraan hari libur umat Kristen di masa depan. Hasil menunjukkan bahwa tidak ditemui perbedaan pada Kalender Indonesia. Ini membuktikan bahwa hari libur umat Kristen di Indonesia tidak pernah menyimpang dari ketentuan. Dengan ini maka program Algoritma Meeus dapat direkomendasikan sebagai program tanda waktu hari libur nasional umat Kristen di Indonesia. KATA KUNCI: Algoritma astronomi meeus, hari libur Kristen, kalender nasiona

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This paper was published in Dialog (E-Journal).

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