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All Journal Ulul Albab: Jurnal Studi dan Penelitian Hukum Islam Afkaruna: Indonesian Interdisciplinary Journal of Islamic Studies Intiqad: Jurnal Agama dan Pendidikan Islam YUDISIA : Jurnal Pemikiran Hukum dan Hukum Islam Heritage of Nusantara: International Journal of Religious Literature and Heritage MIQOT: Jurnal Ilmu-ilmu Keislaman MAHKAMAH: Jurnal Kajian Hukum Islam JIPFRI (Jurnal Inovasi Pendidikan Fisika dan Riset Ilmiah) Titian Ilmu: Jurnal Ilmiah Multi Sciences Jurnal Environmental Science MUST: Journal of Mathematics Education, Science and Technology Prosiding SNFA (Seminar Nasional Fisika dan Aplikasinya) Jurnal Pendidikan Islam Jurnal SOLMA Al-MARSHAD: Jurnal Astronomi Islam dan Ilmu-Ilmu Berkaitan ORBITA: Jurnal Pendidikan dan Ilmu Fisika Jurnal Dinamika Sosial Budaya Journal of Contemporary Islam and Muslim Societies Idrak: Journal of Islamic Education Al-Hikmah: Jurnal Agama dan Ilmu Pengetahuan IJISH (International Journal of Islamic Studies and Humanities) Jurnal Kumparan Fisika Journal of Islam and Science Indonesian Review of Physics (IRiP) Ihsan: Jurnal Pengabdian Masyarakat Jurnal Ilmu Pemerintahan, Administrasi Publik, dan Ilmu Komunikasi (JIPIKOM) ELFALAKY: Jurnal Ilmu Falak Maslahah: Jurnal Pengabdian Masyarakat Al-Fikru: Jurnal Ilmiah Proceeding International Seminar of Islamic Studies Al-Hilal: Journal of Islamic Astronomy Al-Afaq: Jurnal Ilmu Falak dan Astronomi Tsaqila Jurnal Pendidikan dan Teknologi Edu Society: Jurnal Pendidikan, Ilmu Sosial dan Pengabdian Kepada Masyarakat Jumantara: Jurnal Manuskrip Nusantara DIKTUM: JURNAL SYARIAH DAN HUKUM Astroislamica: Journal of Islamic Astronomy QANUN: Journal of Islamic Laws and Studies Heritage of Nusantara: International Journal of Religious Literature and Heritage Jurnal Ilmu dan Inovasi Fisika Jurnal Pendidikan Islam Azkayra: Jurnal Pengabdian Masyarakat dan Sosial Al-Ahkam: Jurnal Ilmu Syari'ah dan Hukum Taushiah: Jurnal Hukum, Pendidikan dan Kemasyarakatan JIPFRI (Jurnal Inovasi Pendidikan Fisika dan Riset Ilmiah)
Arwin Juli Rakhmadi
Universitas Muhammadiyah Sumatera Utara
Religion Arts Humanities Astronomy Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

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Problematika Penentuan Hari Tarwiyah dan Arafah dalam Perspektif Ilmu Falak Marataon Ritonga; Arwin Juli Rakhmadi; Hariyadi Putraga; Muhammad Hidayat
Astroislamica: Journal of Islamic Astronomy Vol. 2 No. 1 (2023): Astroislamica: Journal of Islamic Astronomy (Juni)
Publisher : Islamic Astronomy Department, Sharia and Law Faculty

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47766/astroislamica.v2i1.1093

Abstract

For a long time, Muslims were facing problems related to the determination of the Tarwiyah and the Arafat fasting day. In this case, whether Muslims should follow the Saudi Arabian calendar or the local one. In this study, Muslims differ in opinion, some argue that they should follow the Saudi Arabia calendar and others say that enough to follow the national calendar. The absence of unified calendar resulted in many problems faced by Muslims in assigning their holidays such as Ramadan, Shawwal, and Dhulhijah. To achieve Muslim unification in conducting various religious rituals, Muslims must have a unification dating system in order to realize togetherness in determining the worshipping time. This research is literature research. Thus the data that used in the form of books, journals, and other references. The results concluded that the determination of Tarwiyah and f Arafat Day until now still provides dispute among Muslims, there are those who argue specifically in determining the Dhulhijah beginning must be oriented to the Saudi Arabia kingdom’s determination. While others argue that assigning the worshipping time does not have to follow Saudi Arabia, just adhering to the nation’s determination
TM. Ali Muda (w. 2005 M) Karya dan Kontribusinya dalam Bidang Ilmu Falak Arwin Juli Rakhmadi; Mario Kasduri; Muhammad Qorib; Habibullah Ritonga; Robie Fanreza; Abdul Rahman Cemda
Astroislamica: Journal of Islamic Astronomy Vol. 2 No. 2 (2023): Astroislamica: Journal of Islamic Astronomy (Desember)
Publisher : Islamic Astronomy Department, Sharia and Law Faculty

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47766/astroislamica.v2i2.1930

Abstract

TM. Ali Muda is a North Sumatran astronomy figure who came from Aceh. His work and contribution in the field of astronomy is beyond doubt. His thinking in the matter of determining the beginning of the month is to combine calculations and field observations. However, the tendency of his calculation (hisab) is also quite dominant which is shown by his analysis in various issues of celestial jurisprudence. Meanwhile, in the matter of matlak and Eid al-adha, the hajj-related services whose implementation is only in Mecca, according to him, are obliged to hold on to the matlak of Mecca, while those whose implementation is not only in Mecca are obliged to hold on to their respective matlak
Perbandingan Medan Pandang Teleskop dalam Pengamatan Konjungsi Bulan – Jupiter dari Kota Medan, Barus, dan Lhokseumawe Hariyadi Putraga; Muhammad Dimas Firdaus; Marataon Ritonga; Arwin Juli Rakhmadi; Ruslandi Ruslandi; Ismail Ismail
Astroislamica: Journal of Islamic Astronomy Vol. 3 No. 1 (2024): Astroislamica: Journal of Islamic Astronomy (Juni)
Publisher : Islamic Astronomy Department, Sharia and Law Faculty

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47766/astroislamica.v3i1.2816

Abstract

Astronomical phenomenon occur for only a limited amount of time. Observing these phenomenon requires competent promoters and appropriate instruments. The field of view is one of the things that needs to be clearly known so that the observation can take place properly. In this study, joint observations were made between IAIN Lhokseumawe Falak Science Study Programme and OIF UMSU in Medan and Barus. The instruments used in these observations are different, resulting in a variety of fields of view and calculations are needed to get a description of the results. This study aims to calculate the field of view and visibility of the observed phenomenon, the conjunction of the Moon - Jupiter. The results obtained are for the instrument used by IAIN Lhokseumawe Falak Science Study Program at Malikussaleh Observatory has a field of view of 2°7'46.13‘ × 1°25'22.25’, the instrument used by UMSU Medan Falak Science Observatory has a field of view of 1°8'26.96‘ × 0°54'45.57’, and the instrument used by the OIF UMSU Barus team has a field of view of 1°0'43.74’ × 0°41'1.98. Using this combination of instruments cannot observe the conjunction phenomenon, because the elongation of the Moon - Jupiter at the time of the observation is >4°, so to be able to get the visibility of the phenomenon in 1 image requires an instrument that produces a field of view of ~5°.
Transformasi Hisab-Rukyat Dalam Penentuan Awal Bulan Hijriah di Muhammadiyah Ritonga, Marataon; Rakhmadi, Arwin Juli; Hidayat, Muhammad; Putraga, Hariyadi
Al-Hikmah: Jurnal Agama dan Ilmu Pengetahuan Vol. 21 No. 1 (2024): Al-Hikmah: Jurnal Agama dan Ilmu Pengetahuan (AJAIP)
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/al-hikmah:jaip.2024.vol21(1).14676

Abstract

Muhammadiyah as a tajdid (renewal) movement will continue to improve the system in determining the beginning of hijri month through studies, discussions seminars, and research so that the methods and criteria used are truly following the Qur’an, hadith and the Muslims needs in the world. This research purpose to analyze, explore, and discover the transformation and changes in methods made by Muhammadiyah to determine the new month. The research method in this study is a literature study, by conducting a study and book analysis, journals, Suara Muhammadiyah magazines, and related references that have a close relationship with the studies. Based on the study, it shows that Muhammadiyah has made several transformations in its ijtihad to determine the beginning of the new hijri month, starting from the hisab imkanur rukyat sytem, then replaced with the hisab ijtima’ qabl al-ghurub, and the last one was perfected with the hisab wujudul hilal.
The Sun's Vertical Depression Effect on True Dawn: A Visual Observation Study Hariyadi Putraga; Arwin Juli Rakhmadi; Ahmad Abdulwfa
Astroislamica: Journal of Islamic Astronomy Vol. 5 No. 1 (2026): Astroislamica: Journal of Islamic Astronomy (June)
Publisher : Islamic Astronomy Department, Sharia and Law Faculty

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47766/astroislamica.v5i1.7573

Abstract

This study aims to analyze the influence of the Sun's vertical depth on the appearance of true Dawn in Medan City using the naked-eye observation method. Observations in Medan show that the true dawn light first appears when the Sun is at a depression angle of −14° to −12° below the eastern horizon. The difference between the visible true Dawn and the official dawn time (-20°) is about 6°. These results are consistent with more than 30 studies conducted across over 10 countries at various latitudes, utilizing approximately five different monitoring methods. These results confirm the need to correct the dawn time based on local observations and actual sky conditions, so that the determination of the time of worship better aligns with astronomical reality.
Pengukuran Kecerahan Langit Malam dan Polusi Cahaya di Provinsi Sumatera Utara Putraga, Hariyadi; Rakhmadi, Arwin Juli; Firdaus, Muhammad Dimas; Hidayat, Muhammad
Prosiding SNFA (Seminar Nasional Fisika dan Aplikasinya) 2022: Prosiding SNFA (Seminar Nasional Fisika dan Aplikasinya) 2022
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/prosidingsnfa.v7i0.71953

Abstract

Abstract: The astronomical phenomenon that occurs at a certain time and duration becomes objects for study and research. However, not every location provides the astronomical phenomenon visibility that observers want. To achieve the best data, the best observer position is also needed. During the author’s experience pursuing astronomical phenomena around North Sumatra, only a few places provide good visibility. This is related to the night sky brightness level and light pollution of the location. The night sky brightness is a variable that needed to be included to determine the location used for astronomical observation points so the observers could get the best results. The measurement was taken using a photometer named Sky Quality Meter in several locations around North Sumatra to find the best sky brightness data value reading. From the measurements, the maximum reading results for the East coast of North Sumatra is 19.39 MPSAS, for mid-North Sumatra 20.92 MPSAS, and for the West coast was 21.87 MPSAS. The location with the best night sky brightness quality and the lowest light pollution is the West coast of North Sumatra.Abstrak: Fenomena astronomi yang terjadi pada waktu dan durasi tertentu menjadi salah satu objek kajian dan penelitian. Namun, tidak semua lokasi memberikan keterlihatan fenomena astronomi seperti yang diinginkan pengamat. Untuk mendapatkan data dengan kualitas terbaik, diperlukan pula lokasi pengamat terbaik. Dalam perjalanan penulis mengejar fenomena astronomi di sekitar Sumatera Utara, hanya beberapa tempat saja yang memberikan hasil keterlihatan dengan baik. Hal ini terkait dengan tingkat kecerahan langit malam dan tingkat polusi cahaya di lokasi tersebut. Kecerahan langit malam merupakan salah satu variabel yang perlu dimasukkan dalam penentuan lokasi pengamatan astronomi agar pengamat bisa mendapatkan hasil terbaik. Pengukuran yang dilakukan menggunakan sebuah fotometer yaitu Sky Quality Meter di beberapa lokasi untuk mendapatkan data kecerahan langit malam di sekitar Sumatera Utara. Dari pengukuran yang dilakukan, didapatkan hasil maksimal untuk pesisir timur Sumatera Utara adalah 19,39 MPSAS, pertengahan Sumatera Utara adalah 20,92 MPSAS, dan untuk pesisir Barat adalah 21,87 MPSAS. Maka lokasi dengan kualitas kecerahan langit malam terbaik dan polusi cahaya paling rendah berada sekitar pesisir Barat Sumatera Utara.
Astronomi Islam Era Dinasti Mamalik (1250-1517) Arwin Juli Rakhmadi
Afkaruna: Indonesian Interdisciplinary Journal of Islamic Studies Vol. 9 No. 1: June 2013
Publisher : Fakultas Studi Islam dan Peradaban, Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/aiijis.2013.0017.26-36

Abstract

Astronomy is special scientific discipline in Islam as it relates to daily Muslim worship practices. In the Mamalik era (1250-1517), especially in Cairo and Damascus regions, Islamic astronomy has developed significantly as can be seen in the new discoveries of astronomical instruments. However, Islamic astronomy in the era of Mamalik conceals a very large amount of scientific knowledge that needs further discussion. As mentioned by King, there were a dozen of Islamic schbolars in astronomy whose treatises and ideas are unrevealed. Therefore contemporary astronomical studies run in higher educational institutions, should also seriously be focused on examining classical knowledge in astronomy. This article discusses the history and develop- ment of Islamic astronomy in the era of Mamalik and their contribution to the body of scientific knowledge in as- tronomy in that period
Perbandingan Medan Pandang Teleskop dalam Pengamatan Konjungsi Bulan – Jupiter dari Kota Medan, Barus, dan Lhokseumawe Hariyadi Putraga; Muhammad Dimas Firdaus; Marataon Ritonga; Arwin Juli Rakhmadi; Ruslandi Ruslandi; Ismail Ismail
Astroislamica: Journal of Islamic Astronomy Vol. 3 No. 1 (2024): Astroislamica: Journal of Islamic Astronomy (Juni)
Publisher : Islamic Astronomy Department, Sharia and Law Faculty

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47766/astroislamica.v3i1.2816

Abstract

Astronomical phenomenon occur for only a limited amount of time. Observing these phenomenon requires competent promoters and appropriate instruments. The field of view is one of the things that needs to be clearly known so that the observation can take place properly. In this study, joint observations were made between IAIN Lhokseumawe Falak Science Study Programme and OIF UMSU in Medan and Barus. The instruments used in these observations are different, resulting in a variety of fields of view and calculations are needed to get a description of the results. This study aims to calculate the field of view and visibility of the observed phenomenon, the conjunction of the Moon - Jupiter. The results obtained are for the instrument used by IAIN Lhokseumawe Falak Science Study Program at Malikussaleh Observatory has a field of view of 2°7'46.13‘ × 1°25'22.25’, the instrument used by UMSU Medan Falak Science Observatory has a field of view of 1°8'26.96‘ × 0°54'45.57’, and the instrument used by the OIF UMSU Barus team has a field of view of 1°0'43.74’ × 0°41'1.98. Using this combination of instruments cannot observe the conjunction phenomenon, because the elongation of the Moon - Jupiter at the time of the observation is >4°, so to be able to get the visibility of the phenomenon in 1 image requires an instrument that produces a field of view of ~5°.
TEORI-TEORI UṢŪL FIKIH TERHADAP PENERAPAN ISTIBDĀL OBJEK WAKAF Ahmad Zuhri Rangkuti; Arwin Juli Rakhmadi
QANUN: Journal of Islamic Laws and Studies Vol. 4 No. 2 (2025): QANUN: Journal of Islamic Laws and Studies, Desember 2025
Publisher : ASIAN PUBLISHER

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58738/qanun.v4i2.1110

Abstract

Istibdāl merupakan salah satu cara untuk menjaga kelestarian objek wakaf, sebagaimana yang ditetapkan oleh para fuqaha mazhab Hanafi. Penelitian ini mengungkap rumusan ulama klasik dan kontemporer tentang persoalan istibdāl objek wakaf pada tataran penerapan kajian Uṣūl Fikih sebagai teori yang dibangun dalam merumuskan hukum penggantian dan penjualan objek wakaf, serta pola istiṣlāḥī dalam menjawab permasalahan istibdāl wakaf. Jenis penelitian ini adalah penelitian kepustakaan, yaitu mengkaji dan menganalisis sumber-sumber tertulis tentang istibdāl wakaf, dengan pendekatan hukum yang menganalisis pendapat para tokoh tentang istibdāl wakaf. Sifat penelitian ini adalah deskriptif-analitis. Metode pengumpulan data dengan metode penelitian kepustakaan dengan bersandar atau menggunakan kartu tulis kepustakaan. Sumber data dari data kepustakaan. Penerapan Uṣūl Fikih sebagai konsep yang dibangun para ahli dalam merumuskan hukum istibdāl wakaf (penggantian dan penjualan objek wakaf) didasarkan pada empat konsep, yaitu: (1) ijmā, (2) aulāwiyyāt (masalah keutamaan), (3) hājat, (4) maṣlaḥah yaitu maṣlaḥah rājiḥah (yang nyata). Para ulama berbeda pendapat tentang kebolehan istibdāl. Ada yang bersifat ketat (muḍayyaq) dan longgar (muwassa') bahkan ada yang melarang sama sekali. Imam mazhab Malik, asy-Syafi'i dan Ahmad menanggapi masalah istibdāl dengan cukup ketat (muḍayyaq).
Analysis of the Government and Muhammadiyah's Determination of the Beginning of Ramadan and Eid Al-Fitr Julia Zain; Arwin Juli Rakhmadi; Sumiati Sumiati
Taushiah: Jurnal Hukum, Pendidikan dan Kemasyarakatan Vol 15, No 1 (2025): Taushiah: Jurnal Hukum, Pendidikan dan Kemasyarakatan
Publisher : Fakultas Agama Islam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/taushiah.v15i1.14287

Abstract

This study aims to analyze the determination of the beginning of Ramadan and Eid al-Fitr by the Indonesian government and Muhammadiyah from the perspectives of Islamic Law and Islamic Astronomy, as well as to examine the development of Muhammadiyah’s method from Wujudul Hilal to the Global Hijri Calendar (KHGT). This study employs a qualitative approach using library research. Data were obtained from the Qur’an, Hadith, official government documents, Muhammadiyah documents, Islamic astronomy literature, Islamic jurisprudence references, and relevant scientific articles. The data were analyzed descriptively, analytically, and comparatively by examining the legal foundations, methods, astronomical criteria, determination mechanisms, and social implications of each approach. The findings indicate that the government determines the beginning of the lunar month through the integration of hisab and rukyat within the isbat session, applying the MABIMS criteria of a minimum lunar altitude of 3° and elongation of 6.4°. Muhammadiyah historically applied Wujudul Hilal and subsequently developed KHGT, which promotes a global calendar based on the principle of one day, one date, using imkan al-rukyat criteria of 5° altitude and 8° elongation. These differences represent dynamic ijtihad influenced by religious texts, astronomy, and institutional authority. Calendar unification requires dialogue, scientific research, and mutual respect for diverse interpretations to ensure certainty in worship and strengthen Muslim unity.
Co-Authors Abu Yazid Raisal Ahmad Abdulwfa Ahmad Zuhri Rangkuti Ajraini Nazli Ajraini Nazli Amrizal Amrizal Amrizal, Amrizal Andika, Muhammad Sadam Cemda, Abdul Rahman Fanreza, Robie Firdaus, Muhammad Dimas Gunawan Gunawan Habibullah Ritonga Hariyadi Putraga Hasrian Rudi Setiawan Hermawan, Leo Hidayat, Muhammad Ida Hanifah Ismail Ismail Isra Hayati Julia Zain Khair, Alfath Leo Hermawan Makromatul Afifah Nasution Marataon Ritonga Mario Kasduri Muhammad Dimas Firdaus Muhammad Dimas Firdaus Muhammad Hidayat Muhammad Qorib Nor Azam bin Mat Noor Nur Nilam Sary Panjaitan Pasaribu, Munawir Radiman Radiman Radiman, Radiman Riskiyan Hadi Robby Pamungkas Ruslandi Ruslandi Sinaga, Roynanda Sumiati Sumiati Thariq, Muhammad Zailani Zailani Zailani, Zailani Zebua, Marfirah Syam