Pengukuran Tingkat Polusi Cahaya dan Awal Waktu Subuh di OIF UMSU dengan Menggunakan Sky Quality Meter

Rakhmadi, Arwin Juli; Setiawan, Hasrian Rudi; Raisal, Abu Yazid

doi:10.30599/jti.v12i2.667

Cited by 6 publications

(4 citation statements)

References 15 publications

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“…Citra visual dari tujuh fase bulan yang terlihat di langit pada waktu yang berbeda, dipotret menggunakan kamera lapangan SONY DSC-H300 dengan cara mengatur auto fokus dan pencahayaan ke mode minimum (-2 EV) dan selanjutnya mengaktifkan mode perbesaran gambar maksimum (optical zoom 30x) yang hasilnya ditunjukan pada Tabel 1. Pengaturan fokus dan perbesaran maksimal dilakukan untuk meningkatkan posibilitas kesuksesan pengamatan dan meminimalisir gangguan seperti polusi cahaya dan kelembaban atmosfer saat lensa kamera diarahkan tepat ke permukaan bulan (Rakhmadi et al, 2020). Citra visual dari penampakan bulan pada kolom tiga menunjukan bentuk permukaan bulan yang berbeda di setiap waktu saat dilihat dari bumi sebagai akibat dari perubahan posisi relatif bulan terhadap bumi dan matahari (Raisal, 2018).…”

Section: Hasil Dan Pembahasan Analisis Citra Visual Fase-fase Bulanunclassified

Analisis Citra Visual Fase-Fase Bulan dalam Tinjauan Sistem Koordinat Bola Langit

Abd. Haji Amahoru,

Ashari Bayu Prasada Dulhasyim,

Sri Rahmadani Pulu

2024

jpm

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Penelitian ini dilakukan dengan mengamati dan merekam citra digital dari setiap fase bulan yang tampak di langit maluku, kemudian dilakukan analisis citra visual berdasarkan sistem koordinat bola langit. Variabel yang diamati dalam penelitian ini berupa data visual dan parameter astronomi yang meliputi: a) Fase Bulan; b) Fraksi Iluminasi Bulan; c) Ketinggian Bulan; d) Ketinggian Matahari; e) Umur bulan; f) Azimuth Bulan; dan g) Azimuth Matahari. Data utama berupa bentuk fase-fase bulan didapatkan dari hasil pemotretan menggunakan kamera lapangan SONY DSC-H300. Data citra visual yang diperoleh pada setiap fase kemudian dianalisis berdasarkan sistem koordinat bola langit yang memberikan hasil berupa data realtime dan gambaran dari bulan dan matahari pada koordinat bola langit yang mempengaruhi terbentuknya fase-fase bulan. Hasil penelitian menunjukan bahwa setiap kali bulan teramati pada fase tertentu maka bulan selalu berada pada ketinggian yang berbeda di atas horizon. Saat fase purnama terjadi, nilai fraksi iluminasi mendekati 100% dengan nilai selisih azimuth antara bulan dan matahari mencapai 180o dan umur bulan mencapai 14-15 hari. Dengan demikian dapat disimpulkan bahwa perubahan bentuk visual pada setiap fase-fase bulan yang kita amati dari bumi diakibatkan oleh perubahan ketinggian, azimuth serta parameter astronomis lainnya yang dimiliki bulan dan matahari dalam kerangka koordinat bola langit sehingga hasil penelitian ini dapat dijadikan sebagai rujukan untuk menganalisis dan memahami mekanisme perubahan bentuk dari setiap fase bulan, sehingga fase-fase bulan tidak hanya dipandang sebatas fenomena alam yang indah, melainkan dapat dipahami sebagai suatu peristiwa sains yang komprehensif.

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Section: Hasil Dan Pembahasan Analisis Citra Visual Fase-fase Bulanunclassified

Analisis Citra Visual Fase-Fase Bulan dalam Tinjauan Sistem Koordinat Bola Langit

Abd. Haji Amahoru,

Ashari Bayu Prasada Dulhasyim,

Sri Rahmadani Pulu

2024

jpm

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“…According to the Ministry of Religious Affairs of the Republic of Indonesia, the start of Fajr prayer in Indonesia is when the sun is at -20 degrees (below the eastern horizon). The issue has re-emerged from several studies presented in various papers in the form of proceedings, journals, and books [3] [4] [5]. One of the studies said that the beginning of Fajr prayer should be when the solar depression angle is at -18 degrees.…”

Section: Introductionmentioning

confidence: 99%

DIY Photometer Performance Test in Determining Morning Twilight

Asmoro,

Susanti,

Utama

et al. 2024

J. Phys.: Conf. Ser.

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Do-It-Yourself (DIY) Sky Quality Meter (SQM) known as D.I.Y – CJ’01 Photometer has been successfully built and tested. Using SQM as a calibrated portable photometer is a hot topic of astronomical research regarding night sky brightness measurement. The output data obtained by the photometer is in unit of magnitude per square arc second (mag/sq arcsecond ∼ mpsas) value with a maximum value of 21.7 mpsas as a quantization of the representation of a very dark sky with the presence of natural airglow. The sky brightness then gradually increases with values up to 16.7 mpsas, which is when the sky is brighter due to the presence of artificial airglow from outdoor artificial lighting such as in big cities. This research aims to determine the D.I.Y – CJ’01 Photometer performance in measuring the sky brightness of morning twilight. The research method used in this work is an experiment with data collection from D.I.Y - CJ’01 Photometer and SQM Unihedron gathered from two locations in Cimahi and Bandung. Data processing shows that the D.I.Y - CJ’01 Photometer mimics the performance of SQM Unihedron, with the the smallest difference for the value of the solar depression angle in morning twilight measurements is 0.06%.

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“…The above argument hints at the importance of a deeper study of the causes of the emergence of such prolonged polemics with appropriate analytical methods. Although research on the beginning of fajr time has been widely done (Ardi, 2020;Herdiwijaya, 2017;Kurniawan & Riyadi, 2021;Rakhmadi, Setiawan, & Raisal, 2020), both scientifically and based on the perspective of sharia, there has been no more specific research examining the determination of the early appearance of fajr ṣādiq as a marker of the entry of the fajr prayer time based on the basic principles of sharia. Asyisya (2017), focused his research on sharia's naṣ and the interpretation of scholars in strengthening the prayer schedule that has been used so far in various Muslimpopulated countries, especially in Morocco, as a rebuttal to the arguments of contemporary researchers and scholars who oppose the schedule and reveal things that are considered as their misunderstandings.…”

Section: Introductionmentioning

confidence: 99%

Untitled

2023

KIJMS

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This study aims to: (1) analyze the factors that cause differences in the determination of the beginning of fajr prayer time; (2) analyze the relevance of the determination of fajr ṣādiq as the beginning of fajr prayer time with the basic principles of Islamic law. This research is qualitative descriptive research using library research methods with normative of sharia and philosophical approach. The results of the study found several things. First, the difference in setting the schedule of fajr prayer is due to differences in the determination of the criteria of the elevation of the sun under the horizon and differences in interpreting the meaning of the naṣ and terms related to the time of fajr prayer, such as fajr, galas, isfār, tabayyun and others. Second, the basic principle in determining the beginning of the time of fajr prayer based on the perspective of Sharia is that the fajr prayer is determined by the signs that are believed, so that the criteria for the appearance of fajr ṣādiq are set at the unquestioned elevation of the sun and with signs that are ḥissiyah (observable with five senses) in accordance with maqāṣid al-taysīr that can be understood and observed by every Muslim. This study contributes to the studies related to determining the start of prayer times. The results of this study provide recommendation in the form of determining the angle of fajr ṣādiq at the criterion between -18º and iḥtiyāṭ 2 minutes or -17.5º, as a precautionary measure, so that the polemic that occurs in the community regarding prayer time schedules is expected to be reduced or even resolved.

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Pengukuran Tingkat Polusi Cahaya dan Awal Waktu Subuh di OIF UMSU dengan Menggunakan Sky Quality Meter

Cited by 6 publications

References 15 publications

Analisis Citra Visual Fase-Fase Bulan dalam Tinjauan Sistem Koordinat Bola Langit

Analisis Citra Visual Fase-Fase Bulan dalam Tinjauan Sistem Koordinat Bola Langit

DIY Photometer Performance Test in Determining Morning Twilight

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