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All Journal Al-MARSHAD: Jurnal Astronomi Islam dan Ilmu-Ilmu Berkaitan Journal Global Technology Computer
Handhita, Emye Tegar
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Astronomy Computer Science & IT Control & Systems Engineering Education Engineering

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Prayer Time Calculation Using Approximated Epimeris Data Handhita, Emye Tegar
Al-Marshad: Jurnal Astronomi Islam dan Ilmu-Ilmu Berkaitan Vol 9, No 2 (2023): Al-Marshad
Publisher : University of Muhammadiyah Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/jam.v9i2.16752

Abstract

Prayer time can be determined by observing sun movement, and can also be determined by mathematical calculation. Determining prayer time by mathematic calculation needs input in form of ephemeris data. Ephemeris data can be obtained from table such as using winhisab application. Other than that ephemeris data can also be obtained by mathematic calculation with approximation method. The data calculated with approximation method is not exactly the same as data obtained from winhisab, however the difference is not that great. Prayer time schedule calculated with approximated data should not be that much different from the one calculated with the data from winhisab.Keyword: Prayer Time, Approximation, Ephemeris, Winhisab
Perhitungan Waktu Ijtimak Awal Bulan Hijriyah Dengan Aplikasi Microsoft Excel Memanfaatkan Algoritma Jean Meeus Handhita, Emye Tegar
Journal Global Technology Computer Vol 4 No 2 (2025): April 2025
Publisher : Forum Kerjasama Pendidikan Tinggi (FKPT)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47065/jogtc.v4i2.7226

Abstract

Muslims have several religious rituals that are being done on certain dates such as the fasting of Ramadan, Eid al-Fitr and the Hajj pilgrimage. These religious rituals are closely related to the Hijri calendar system. The Hijri calendar system is based on the period of Moon's revolution around the Earth. Meanwhile, there are two methods for determining the beginning of the Hijri month, they are Imkanu Rukyat and Wujudul Hilal. Unlike Imkanu Rukyat which requires observation of the Hilal, Wujudul Hilal determines the beginning of the Hijri month entirely based on mathematical calculations. One of important variable in determining the beginning of the Hijri month is the Ijtimak time, which is the time when the Sun overtake the Moon from behind. One of calculation method that can be used to calculate the Ijtimak time is Jean Meeus Algorithm. The Jean Meeus Algorithm has many calculation steps and several complex formulas. To help us doing this calculation, we can use Microsoft Excel application. To find out the accuracy level of the Ijtimak time that has been calculated, it is then compared with the data from NASA's SKYCAL site.
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