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All Journal Jurnal Matematika & Sains Journal of Mathematical and Fundamental Sciences Religio : Jurnal Studi Agama-agama Gravity : Jurnal Ilmiah Penelitian dan Pembelajaran Fisika Jurnal Otomasi Kontrol dan Instrumentasi Mutawatir : Jurnal Keilmuan Tafsir Hadith Journal of Multidisciplinary Applied Natural Science Prosiding Seminar Nasional Sains Teknologi dan Inovasi Indonesia (Senastindo) Indonesian Journal of Physics (IJP) Equator Science Journal (ESJ) Sunan Kalijaga Journal of Physics
Dhani Herdiwijaya
Institut Teknologi Bandung
Religion Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Other

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DIY Photometer-Based Citizen Science for Project-Based Environmental Physics Learning and Light Pollution Literacy Cahyo Puji Asmoro; Rani Nur Widiawati; Asep Akmal Fadia Nurhalim; Abdul Salam; Najmi Hiyan Fathinah; Judhistira Aria Utama; Dhani Herdiwijaya
Equator Science Journal Vol. 4 No. 2 (2026): Equator Science Journal (ESJ)
Publisher : CV. Dharma Samakta Edukhatulistiwa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61142/esj.v4i2.359

Abstract

Artificial light at night (ALAN) is a growing environmental crisis, yet integrating light pollution literacy into science curricula is often hindered by the prohibitive cost of commercial sensors. Addressing this gap, this study examines the DIY CJ’01 photometer as a low-cost, open-source tool for measuring night sky brightness and advancing environmental physics education. Fieldwork across 15 sub-districts in Cimahi City compared the CJ’01 against an industry-standard Sky Quality Meter (SQM). Results demonstrated strong instrumental agreement, yielding a minimal mean discrepancy of 0.16 mag/arcsec². Robust validation via Bland–Altman analysis (bias = −0.157; 95% LoA = −0.465 to 0.152), alongside RMSE (0.218), MAE (0.157), and an Intraclass Correlation Coefficient of 0.832, confirmed its high reliability. Beyond technical validation, embedding the CJ’01 within a Project-Based Learning (PjBL) framework successfully repositioned undergraduate students as active citizen scientists. This instructional design enabled students to translate raw photometric data into baseline sky-brightness maps for municipal use. Ultimately, this experiential approach operationalizes SDG 4.7’s active environmental citizenship, proving that democratized instrumentation can simultaneously serve scientific monitoring and Education for Sustainable Development (ESD).
Interpretasi Global Hadis Rukyat Hilal Rusmin, Pranoto Hidaya; Rohman, Arief Syaichu; Herdiwijaya, Dhani; Khaerani, Izzah Faizah Siti Rusydati; Pahlevi, Reza; Darmawan, Dadang
Mutawatir : Jurnal Keilmuan Tafsir Hadith Vol. 7 No. 1 (2017): JUNI
Publisher : Department of Qur'an dan Hadith Faculty of Ushuluddin and Philosophy UIN Sunan Ampel Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (619.584 KB) | DOI: 10.15642/mutawatir.2017.7.1.105-139

Abstract

Before Islamic Calendar begins, Muslims were used to wait for the earliest visible crescent (hilâl), which marks the beginning of Ramadan. The determination of the beginning of Ramadan is based on the rukyat al-hilâl hadith. Because the hilâl visibility on the earth surface is not the same, it results the differences on the beginning of Ramadan fasting. In addition, the sighting hilâl method can only determine the next 29 days, it cannot reach for the next month and even for the next year. These are the main reasons for re-interpretation of the rukyat al-hilâl hadith from global perspective. From this study, it is found that the context in the Qur’an, related to the Ramadan fasting, is fasting in one full month, 29 or 30 days, according to the duration of the lunar synodic cycle. However, the condition of the people and the science at that time has not developed yet, which is the cause of calculation (h}isâb) verses in the Qur’an cannot be used. When they have developed, the calculation verses in the Qur’an can be used to determine the number of days in a calendar month. This will produce a global calendar for mankind.
Co-Authors A.A. Ketut Agung Cahyawan W Abdul Salam Achmad Fariz Arief Syaichu Rohman, Arief Syaichu Asep Akmal Fadia Nurhalim Asmoro, Cahyo Puji Baju Indradjaja Dadang Darmawan Emanuel Sungging Mumpuni Hana Susanti Judhistira Aria Utama Khamdani, Muhamad Mitra Djamal Najmi Hiyan Fathinah Pranoto Hidaya Rusmin Putri, Annisa Novia Indra Rani Nur Widiawati REZA PAHLEVI Rusydati Khaerani , IzzahFaizah Siti Sherly Imelda Thomas Djamaluddin