The limitation of optical equipment in New Crescent Moon visibility: insight from 27 years of observation data in Sarawak, Malaysia
New Crescent Moon visibility has been extensively studied throughout history due to its undeniable importance in determining the Islamic calendar. Previous visibility models have relied on linear statistical theory, which does not fully account for the circular nature of the variables involved such...
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Penerbit Universiti Kebangsaan Malaysia
2025
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| Online Access: | http://journalarticle.ukm.my/26329/1/SMS%2013.pdf http://journalarticle.ukm.my/26329/ https://www.ukm.my/jsm/english_journals/vol54num9_2025/contentsVol54num9_2025.html |
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| author | Ahmad Hariz Bely, Roslan Umar, Nor Hazmin Sabri, Ahmad Lutfi Afifi Mohd Nasir, Razalie Hussaini, Emma Zulaiha Zulkifli, Amirul Akmal Redzuan, Rakhmadi, Arwin Juli Amirul Hazim Kamarulzaman, Che Ku Ahmad Fuad Che Ku Abdullah, Nur Azhar Ahmad, Nur Zulaikha Mohd Afandi, Sharifah Nurul Aisyah Syed Zafar, Jalalludin Bakar, Musa Garba Abdullahi, |
| author_facet | Ahmad Hariz Bely, Roslan Umar, Nor Hazmin Sabri, Ahmad Lutfi Afifi Mohd Nasir, Razalie Hussaini, Emma Zulaiha Zulkifli, Amirul Akmal Redzuan, Rakhmadi, Arwin Juli Amirul Hazim Kamarulzaman, Che Ku Ahmad Fuad Che Ku Abdullah, Nur Azhar Ahmad, Nur Zulaikha Mohd Afandi, Sharifah Nurul Aisyah Syed Zafar, Jalalludin Bakar, Musa Garba Abdullahi, |
| author_sort | Ahmad Hariz Bely, |
| building | Tun Sri Lanang Library |
| collection | Institutional Repository |
| content_provider | Universiti Kebangsaan Malaysia |
| content_source | UKM Journal Article Repository |
| continent | Asia |
| country | Malaysia |
| description | New Crescent Moon visibility has been extensively studied throughout history due to its undeniable importance in determining the Islamic calendar. Previous visibility models have relied on linear statistical theory, which does not fully account for the circular nature of the variables involved such as atmospheric turbulence, light pollution and limitations of optical equipment. In order to address this matter, this study proposed a new visibility using the limitation of New Crescent Moon sighting via an optical equipment. Data were categorized into two visibility categories, namely: visible to the theodolite and potentially requiring telescopes based on the night visibility that has been captured. The categorization is determined based on the residual local data observations collected in Sarawak, spanning from 1997 to 2023. The proposed limitation was applied by 31 positive data from 167 observations which results indicate that the visibility based on moon ages and altitude of the moon features parameter. This study suggested that the limitation of sighting the New Crescent Moon using an optical equipment range between 11 and 13 h of moon age with a moon altitude of 5° and 6°. These new criteria have a significant positive impact on enhancing the likelihood of observing the New Crescent Moon and improving the accuracy of the Islamic calendar especially in Sarawak. |
| format | Article |
| id | my-ukm.journal.26329 |
| institution | Universiti Kebangsaan Malaysia |
| language | en |
| publishDate | 2025 |
| publisher | Penerbit Universiti Kebangsaan Malaysia |
| record_format | eprints |
| spelling | my-ukm.journal.263292026-01-08T02:05:52Z http://journalarticle.ukm.my/26329/ The limitation of optical equipment in New Crescent Moon visibility: insight from 27 years of observation data in Sarawak, Malaysia Ahmad Hariz Bely, Roslan Umar, Nor Hazmin Sabri, Ahmad Lutfi Afifi Mohd Nasir, Razalie Hussaini, Emma Zulaiha Zulkifli, Amirul Akmal Redzuan, Rakhmadi, Arwin Juli Amirul Hazim Kamarulzaman, Che Ku Ahmad Fuad Che Ku Abdullah, Nur Azhar Ahmad, Nur Zulaikha Mohd Afandi, Sharifah Nurul Aisyah Syed Zafar, Jalalludin Bakar, Musa Garba Abdullahi, New Crescent Moon visibility has been extensively studied throughout history due to its undeniable importance in determining the Islamic calendar. Previous visibility models have relied on linear statistical theory, which does not fully account for the circular nature of the variables involved such as atmospheric turbulence, light pollution and limitations of optical equipment. In order to address this matter, this study proposed a new visibility using the limitation of New Crescent Moon sighting via an optical equipment. Data were categorized into two visibility categories, namely: visible to the theodolite and potentially requiring telescopes based on the night visibility that has been captured. The categorization is determined based on the residual local data observations collected in Sarawak, spanning from 1997 to 2023. The proposed limitation was applied by 31 positive data from 167 observations which results indicate that the visibility based on moon ages and altitude of the moon features parameter. This study suggested that the limitation of sighting the New Crescent Moon using an optical equipment range between 11 and 13 h of moon age with a moon altitude of 5° and 6°. These new criteria have a significant positive impact on enhancing the likelihood of observing the New Crescent Moon and improving the accuracy of the Islamic calendar especially in Sarawak. Penerbit Universiti Kebangsaan Malaysia 2025 Article PeerReviewed application/pdf en http://journalarticle.ukm.my/26329/1/SMS%2013.pdf Ahmad Hariz Bely, and Roslan Umar, and Nor Hazmin Sabri, and Ahmad Lutfi Afifi Mohd Nasir, and Razalie Hussaini, and Emma Zulaiha Zulkifli, and Amirul Akmal Redzuan, and Rakhmadi, Arwin Juli and Amirul Hazim Kamarulzaman, and Che Ku Ahmad Fuad Che Ku Abdullah, and Nur Azhar Ahmad, and Nur Zulaikha Mohd Afandi, and Sharifah Nurul Aisyah Syed Zafar, and Jalalludin Bakar, and Musa Garba Abdullahi, (2025) The limitation of optical equipment in New Crescent Moon visibility: insight from 27 years of observation data in Sarawak, Malaysia. Sains Malaysiana, 54 (9). pp. 2263-2276. ISSN 0126-6039 https://www.ukm.my/jsm/english_journals/vol54num9_2025/contentsVol54num9_2025.html |
| spellingShingle | Ahmad Hariz Bely, Roslan Umar, Nor Hazmin Sabri, Ahmad Lutfi Afifi Mohd Nasir, Razalie Hussaini, Emma Zulaiha Zulkifli, Amirul Akmal Redzuan, Rakhmadi, Arwin Juli Amirul Hazim Kamarulzaman, Che Ku Ahmad Fuad Che Ku Abdullah, Nur Azhar Ahmad, Nur Zulaikha Mohd Afandi, Sharifah Nurul Aisyah Syed Zafar, Jalalludin Bakar, Musa Garba Abdullahi, The limitation of optical equipment in New Crescent Moon visibility: insight from 27 years of observation data in Sarawak, Malaysia |
| title | The limitation of optical equipment in New Crescent Moon visibility: insight from 27 years of observation data in Sarawak, Malaysia |
| title_full | The limitation of optical equipment in New Crescent Moon visibility: insight from 27 years of observation data in Sarawak, Malaysia |
| title_fullStr | The limitation of optical equipment in New Crescent Moon visibility: insight from 27 years of observation data in Sarawak, Malaysia |
| title_full_unstemmed | The limitation of optical equipment in New Crescent Moon visibility: insight from 27 years of observation data in Sarawak, Malaysia |
| title_short | The limitation of optical equipment in New Crescent Moon visibility: insight from 27 years of observation data in Sarawak, Malaysia |
| title_sort | limitation of optical equipment in new crescent moon visibility: insight from 27 years of observation data in sarawak, malaysia |
| url | http://journalarticle.ukm.my/26329/1/SMS%2013.pdf http://journalarticle.ukm.my/26329/ https://www.ukm.my/jsm/english_journals/vol54num9_2025/contentsVol54num9_2025.html |
| url_provider | http://journalarticle.ukm.my/ |