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INTEGRASI HISAB RUKYAT AWAL RAMADAN 1442 H DENGAN MODEL VISIBILITAS KASTNER sakirman, sakirman; Utama, Judhistira Aria; Zainon, Othman bin
ELFALAKY: Jurnal Ilmu Falak Vol 6 No 2 (2022): Desember
Publisher : UIN ALAUDDIN MAKASSAR

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/ifk.v6i2.30766

Abstract

There is no empirical evidence of the early hilal of Ramadan 1442 H that was observed through technological devices. The justification for witnessing the new moon still refers to the syar'i new moon term, not the astronomical new moon. The country of Brunei Darussalam can be used as an example when the astronomical hilal is not successfully observed, then the beginning of the hijri month is the next day or fulfills the ongoing month and there is no legal tolerance such as the use of the syar'i hilal term to replace the astronomical hilal. The integration of reckoning-rukyat is actually a methodological endeavor to perfect the criteria for the beginning of the Hijri month. Kastner's hilal visibility model is present in an effort to bridge the refinement of the criteria for the beginning of the hijri month. Through the criteria for the visibility of the hilal, Kastner offers a mathematical model that can be used as a role model for observing the hilal. Kastner's hilal visibility mathematical calculation model can be expressed in a curve that can be translated easily. Based on Kastner's hilal visibility, the early hilal of Ramadan 1442 H the hilal cannot be observed with the visual eye. Perukyat's testimony of seeing the hilal at the beginning of Ramadan 1442 H can be rejected by law because it is not based on empirical evidence in the form of a hilal image as a result of visual eye observation. According to Kasnter's hilal visibility model, the visibility of the hilal at the beginning of Ramadan 1442 H reached the maximum hilal visibility with a value of -1.68 for visual observations, the height of the hilal at the same time was 1.56 degrees (height difference between the Moon and the Sun at that time was 4, 46 degrees) with an elongation of 4.70 degrees. Observing the new moon without using tools such as a telescope, will not succeed in detecting the figure of the new moon, because the visibility of the new moon is still negative since sunset.
Research Trends About Education for Sustainable Development (ESD) in Science Learning: A Bibliometric Analysis During 2014-2024 Entang, Entang; Utama, Judhistira Aria; Liliawati, Winny; Sohn, Jungjoo; Wahyudi, Ismu
Jurnal Pendidikan MIPA Vol 25, No 3 (2024): Jurnal Pendidikan MIPA
Publisher : FKIP Universitas Lampung

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Abstract

Education for Sustainable Development (ESD) has become a critical focus in science learning as it addresses global challenges such as climate change, sustainability awareness, and resource management. However, research on ESD in science education lacks a cohesive understanding of its thematic trends, global contributions, and the role of educators. This study aims to analyze the research landscape of ESD in science learning, identify dominant thematic trends, determine leading countries in publications, and emphasize the importance of teacher understanding in implementing ESD. A bibliometric analysis was conducted using the Scopus database, with data retrieved on May 17, 2024, using the keywords “ESD in Science Learning.” The study analyzed 79 publications from 2014 to 2024, including journal articles, conference papers, reviews, and proceedings. The Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) framework was applied to screen and organize the data. Bibliometric mapping with VOSviewer revealed key thematic trends, including sustainability education, climate change, collaborative learning, and innovation in teaching. Results indicate that most research originates from developed countries, with social sciences and environmental science as the dominant subject areas. Additionally, findings highlight the urgent need for teacher capacity building to effectively integrate ESD principles into science curricula. In conclusion, this study provides a comprehensive overview of ESD research in science learning, identifies gaps, and highlights opportunities for future research and teacher training to promote sustainable development goals (SDGs).        Keywords: education for sustainable development, science learning, bibliometric analysis, PRISMA.DOI: http://dx.doi.org/10.23960/jpmipa/v25i3.pp1317-1328
Construct Validity Analysis of Stellar Evolution Concept Mastery Test to Reduce Misconceptions Permata, Hilda; Liliawati, Winny; Utama, Judhistira Aria
Proceedings International Conference on Education Innovation and Social Science 2024: Proceedings International Conference on Education Innovation and Social Science
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

This study aims to determine the validity of an instrument that is able to measure misconceptions and accommodate multiple intelligences. The development of the Star Evolution Concept Mastery Test instrument is an instrument containing fifteen multiple choice questions based on stellar evolution material from the beginning of the birth of a star to the death of a star. This research uses the Research & Development (R&D) method. To determine the validity of this instrument, expert judgment was carried out by two experts in their fields. Expert judgment was conducted to determine construct validity. From the results of the analysis, it was found that almost all questions were accepted and could be used after revision according to the notes from the experts. So that the instrument is considered feasible and declared valid, which means that this instrument can measure misconceptions and can be used.
Evaluating Research Trends and Gaps in Disaster Literacy within Science Education: A Bibliometric Perspective Prasetyaningsih Prasetyaningsih; Ida Kaniawati; Lala Septem Riza; Judhistira Aria Utama
Journal Evaluation in Education (JEE) Vol 6 No 1 (2025): January
Publisher : Cahaya Ilmu Cendekia Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37251/jee.v6i1.1248

Abstract

Purpose of the study: This study aims to evaluate research trends, gaps, and global patterns in disaster literacy within science education to identify areas for improvement and provide actionable recommendations for enhancing education strategies in disaster-prone regions. Methodology: A bibliometric analysis was conducted using data from the Scopus database (2000-2024). Tools used include R Studio with the Bibliometrix package for generating visualizations such as co-occurrence networks, word clouds, and trend analyses. The dataset comprises 315 articles selected using “disaster literacy” and "science education". Main Findings: Findings indicate an increasing focus on disaster literacy research, with eminent themes such as technology integration and project-based learning. However, significant gaps remain in contributions from developing nations and the long-term evaluation of disaster literacy programs. Collaborative international research has been identified as a growing trend. Novelty/Originality of this study: This study uniquely combines bibliometric analysis with an evaluative approach to highlight disparities in disaster literacy research and propose strategies for improving curriculum integration and global collaboration. It advances understanding by identifying underexplored areas and providing a foundation for targeted educational interventions.
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).