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Ahmad Izzuddin
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Al-Hilal: Journal of Islamic Astronomy
Published by Universitas Islam Negeri Walisongo Semarang
ISSN : 27751236     EISSN : 27752119     DOI : https://doi.org/10.21580/al-hilal
Core Subject : Religion, Science, Social,
Religion Astronomy Earth & Planetary Sciences Physics Social Sciences
Al-Hilal Journal is a scientific journal published in April and October per year by the Islamic Astronomy at the Faculty of Sharia and Law, Universitas Islam Negeri (UIN) Walisongo, Semarang colaboration with Asosisasi Dosen Falak Indonesia (ADFI). Articles published in this journal are the results of empirical research in Islamic Astronomy (such as qibla, salat times, Islamic Calendar, Eclipse and others), and its approaching on other area studies (mathematics, physics, astrophysics, social, politics, anthropology, ethnography and others). This journal has specifications as a medium of publication and communication of Islamic Astronomy ideas derived from theoretical and analytical studies, as well as research results in the field of both natural and social science. The editor hopes that writers, researchers and legal experts will contribute in this journal.
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 6 Documents
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Search results for , issue "Vol 3, No 2 (2021)" : 6 Documents clear
ITTIHAD AND IKHTILAF AL MATHLA' (DISCOURSE AND ITS IMPLEMENTATION) Izza Nur Fitrotun Nisa'; Mochamad Ulinnuha
Al-Hilal: Journal of Islamic Astronomy Vol 3, No 2 (2021)
Publisher : Fakultas Syari'ah dan Hukum UIN Walisongo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/al-hilal.2021.3.2.8120

Abstract

The determination of the day in Islam is particularly influential, especially in terms of worship, the determination of the beginning of the islamic lunar month, which corresponds to the circulation of the Moon. One Hijri month comprises 29 or 30 days. There are two methods in calculating the beginning of the islamic lunar month, that is the hisab method and the rukyat method. From both approaches, the term mathla' (area boundaries based on the reach of the new Moon) originates. Mathla' is divided into mathla' ikhtilaf (local mathla') and mathla' ittihad (global mathla'). From the two mathla', there are diverse opinions regarding the use of mathla'. Therefore, the government is present and seeks to avoid this imbalance through imkan ar rukyat. This research involves qualitative research, categorized as library research, described descriptively with systematic, correct explanations and relevant sources. The dialogue on the two mathla' is reaping the pros and downsides among numerous madhhab imams and Muslim personalities. The three madhhab priests believe that global mathla' is the reference for the people, except for the Shafi'i priest. Figures such as Hasbi Ash shiddieqy consider that global mathla 'as a basis for attaining the unity of the ummah. In contrast to Thomas Djamaluddin, Basit Wahid and Yusuf al-Qaradhawi who prefer local mathla' as a reference. This study also examines the application connected to mathla', namely the Islamic Calendar at Turkey's International Hijri Calendar Unity Conference (IHCUC) congress. What has implications or effects if the new moon on one continent has appeared is not necessarily the same on other continents. This happens because  the geographical position of the area is different. It gives a favourable critique to establish a shared opinion for the benefit of the people.
THE EFFECT OF MAGNETIC DECLINATION CORRECTION ON SMARTPHONES COMPASS SENSORS IN DETERMINING QIBLA DIRECTION Akhmad - Husein; Ahmad - Izzuddin; Muhammad Said Fadhel
Al-Hilal: Journal of Islamic Astronomy Vol 3, No 2 (2021)
Publisher : Fakultas Syari'ah dan Hukum UIN Walisongo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/al-hilal.2021.3.2.8309

Abstract

Qibla direction application on android phones generally utilizes a compass sensor (magnetic orientation) as a reference to determine the direction and detect qibla direction. The accuracy of the compass sensor in determining the direction of qibla is still doubtful, because the compass sensor is easily affected by the surrounding magnetic field, and the north direction shown by the compass sensor is not the geographical North direction but the north direction of the Earth's magnetic field. It certainly has a very influential effect on the accuracy of compass sensors in determining the direction of Qibla. The north direction produced by the compass sensor can be converted into the geographical north by adding a magnetic declination correction value. This study aims to analyze the effect of magnetic declination correction on the accuracy of compass sensors on android phones in determining qibla direction. The type of research used is a type of field research with a quantitative approach. In this study, observation was done by comparing the qibla direction of the android compass sensor with the qibla direction of a theodolite. The study showed that qibla direction measurement using android compass sensor with magnetic declination correction of angle difference (deviation) of 03° 55' 0.055" or 437.6815289 km, against qibla direction of the theodolite.
MECCA MEAN TIME PROBLEMATIC AS A WORLD TIME REFERENCE Raizza Kinka Intifada; Nuril Fathoni Hamas
Al-Hilal: Journal of Islamic Astronomy Vol 3, No 2 (2021)
Publisher : Fakultas Syari'ah dan Hukum UIN Walisongo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/al-hilal.2021.3.2.8270

Abstract

Desire of Muslims to replace the present standard of time, namely Greenwich Mean Time, to Mecca Mean Time is the manifestation of a new spirit in the Islamic world in particular. Mecca Mean Time makes al-Abraj tower (Mecca Royal Clock) the zero degree point or standard for the commencement of global time. The goal of this study is to find out what are the challenges that occur when Mecca Mean Time is used as a reference for global time. This research is a sort of qualitative research involving library research studies by describing descriptively. After the data is obtained, the author will categorize, analyze and present it in the form of a brief and systematic document. In this study, it was revealed that there was a debate of variations in views amongst different specialists when MMT was utilized as a reference for global time. Bambang Eko Budhiyono is striving very hard to achieve MMT as a world time reference on the basis of interpretation of the Qur'an verse 1 al-Hujurat. Meanwhile, Thomas Djamaluddin has a different perspective since physically and geographically there are no qualities that assist it to make it a time reference or as a main meridian (Prime Meridian) except religious spirit.
NAKED EYE ESTIMATES OF MORNING PRAYER AT TUBRUQ OF LIBYA Amir Hussein Hassan; Yasser Abdel-Fattah Abdel-Hadi; Usama Ali Rahoma; I. A. Issa
Al-Hilal: Journal of Islamic Astronomy Vol 3, No 2 (2021)
Publisher : Fakultas Syari'ah dan Hukum UIN Walisongo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/al-hilal.2021.3.2.8625

Abstract

Naked eye observations at Tubruq sky (φ = 32° 05´, λ = 23° 59´) in Libya at the Mediterranean coast (see-desert background) during the two years (2008 – 2009) of morning twilight have been recorded.  These observations led us to get some estimates about morning twilight, as it is necessary to determine the time of the True Dawn (Al-Fajr Prayer Time).  this research aims to determine the correct time of Al-Fajr Prayer by finding the accurate angle of the sun vertical depression below the horizon that is associated with legitimate mark. The Methode used in this research was field research while the observations have been recorded by monitoring the first white thread on the eastern horizon (True Dawn) that announces the time of the Morning Prayer (Al-Fajr Prayer).  The azimuthally range of observation about the solar vertical extends from 0° up to ±20°, while the phenomenon was followed from 0° up to 20° along the altitudinal range.  This research gives a result that a beginning of the morning twilight is estimated to be around 13.5° depression of the sun below the horizon.  This value can reach a minimum depression around 11.5° at low visibility and a maximum around 13.5° at a very god visibility.
THE USAGE OF UBVRI FILTERS AND SKY BRIGHTNESS MEASUREMENT (Study on 26 May 2021 Total Lunar Eclipse at ITERA Lampung Astronomical Observatory ) Hendra Agus Prastyo; Khabib Suraya; Singgih Prana Putra; Aditya Abdilah Yusuf; Izatul Hafizah; Adhitya Oktaviandra; Aziz Nugrahamuda Khagahdo; M R Kurniawan; Gabriella Maharani; Ababil Silahuddin
Al-Hilal: Journal of Islamic Astronomy Vol 3, No 2 (2021)
Publisher : Fakultas Syari'ah dan Hukum UIN Walisongo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/al-hilal.2021.3.2.8485

Abstract

On May 26, 2021, the ITERA Lampung Astronomical Observatory (OAIL) got the opportunity to watch the Total Lunar Eclipse (TLE). The observations had two goals: determining the most efficient filter for observing the Penumbral Lunar Eclipse (PLE) and determining the influence of TLE phenomena on sky brightness. The acquired picture data is analyzed using the photometric approach. Six sample points are utilized to calculate the magnitude of the PLE. According to the findings, the blue filter is the generally ideal filter for detecting PLE. Tycho crater had the greatest magnitude of -18.1 while mare Imbrium had the highest magnitude of -17.2. When determining the intensity of the crater and mare, this value is impacted by various parameters, including the duration of the integration period and the aperture radius. As a result, this number still has to be adjusted to the full moon's intensity. The results of SQM measurements of the sky's brightness form a light curve pattern that declines during the umbra phase and continues to diminish until the Moon departs the Earth's penumbra. This shows that the value of sky brightness increases or the sky becomes significantly darker during the total phase, while the Moon's skyglow diminishes during TLE.
ZODIAC LIGHT DETECTION BASED ON SKY QUALITY METER (SQM) DATA: PRELIMINARY STUDY Hendro Setyanto; Hendra Agus Prastyo; Muhammad Basthoni; Fika Afhamul Fuscha; Saleh M. Al Saab
Al-Hilal: Journal of Islamic Astronomy Vol 3, No 2 (2021)
Publisher : Fakultas Syari'ah dan Hukum UIN Walisongo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/al-hilal.2021.3.2.8477

Abstract

Zodiacal light is a night sky phenomenon that can occur before or after dusk. Additionally, zodiacal light is referred to as false dawn (fajar kadzib) or false dusk. Zodiacal light is emitted by the dust leftovers of asteroids, comets, and other extraterrestrial objects colliding along the planet Mercury's orbit to Mars. This remaining material orbits the Sun in the same direction as the four planets. When the Sun illuminates the leftover dust, it appears as a zodiacal light in the hemisphere that experiences dawn or dusk. By using linear fittings we detect the presence of zodiacal light on the light curve of the night skybrightness. The Observations were made using a digital camera and SQM. From a number of observational data obtained at six locations, it shows that there is an identical linear pattern. From this linear model, it can be seen that the zodiacal light has been observed since the sun's position at -60 degrees below the horizon. Recognizing the presence of the zodiacal light is very important to know the time of the appearance of true dawn which is the beginning of the time for the dawn prayer.

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