The table above provides the dates and concise data to hunt for the youngest possible lunar crescent in this country, which is a very challenging activity.
First sighting of the new crescent moon is used as the basis of various calendars to signal the start of the new month. For instance, Islam requires that the sighting of the the new crescent moon should be made with the naked eye.
Predicting the first sighting of the new crescent moon has been attempted since the time of the Babylonians. These ancient methods relied on the age of the Moon and the time difference between moonset and sunset. More modern methods use the angular separation of the Sun and Moon, the altitude difference between the Sun and Moon, their relative azimuths and the width of the crescent.
The following table shows the dates of possible first sighting of new moon crescent (in Arabic known as hilal) for Brunei Darussalam. These dates are colour-coded based on the moon altitude and a crude prediction of the new moon sighting can be related as follow:
1. Red that indicates the moon altitude which is less than 2°. A very slim chance of visibility due to low altitude.
2. Orange that signifies the moon altitude between 2° and 5.5°. There is a slim chance of crescent visibility. However visibility might be improved with the use of optical aids and excellent atmospheric conditions.
3. Yellow that the moon is at altitude between 5.5° and 7.5°. There is a good chance that the crescent is visible to the naked eyes under excellent atmospheric conditions.
4. Green that shows the moon’s altitude is more than 7.5°. The lunar crescent is positioned reasonably high above the horizon making it easily visible to the naked eye.
If you manage to sight the crescent on the dates provided, please share your experience and photos via email@example.com
Present at the observation were Pengiran Shahdani (Vice President II), Awang Hj Mohamad Azri (Exco) and 4 other members.
The result of the observation was submitted to Islamic Crescents’ Observation Project (ICOP). See worldwide observation result here.
Assigned vantage points throughout the country could sight the new moon of Syawal 1432 H. The official announcement of the sighting was also made on TV and Radio and Brunei Darussalam starts Aidilfitri tommorrow, 31 August 2011.
This is a table computed by Her Majesty’s Nautical Almanac Office computes and distributes predictions of lunar crescent visibility for Bandar Seri Begawan, Brunei Darussalam from Year 1980 until 2030.
Visibility Predictions for the New Crescent Moon are catagorised by
A Easily visible
B Visible under perfect conditions
C May need optical aid to find the crescent Moon
D Will need optical aid to find the crescent Moon
E Not visible with a telescope
F Not visible, below the Danjon limit
The first crescent or hilal was visible from this country during the new moon sighting by the Survey Department on July 15. Based on the account, the moon’s altitude was
about 10.465 degrees, elongation of 11.223 degrees and it was 22 hours 33 minutes old at sunset. The visibility based on Mooncalc indicates that on 15th July 2007, the new moon should be easily visible from many parts of the world but ICOP report generalised, Brunei being the first eastern country to sight the new moon crescent.
Congratulation to the moon sighting committees of the Survey Department.
Bandar Seri Begawan, 13 November 2004 – Rukyah Hilal Syawal diadakan pada petang hari ini bersamaan 29 Ramadhan.
Persatuan Astronomi Negara Brunei Darussalam juga membuat cerapan anak bulan pada petang tadi bertempat di kawasan lapang Bukit Agok, Tutong. Hanya empat orang ahli PABD yang hadir untuk pencerapan.
Walaupun kawasan sebelah ufuk barat berawan sedikit, sabit anak bulan yang berumur kurang dari 20 jam telah kelihatan selepas beberapa minit matahari terbenam.
Continue reading “2004 Nov 13 Laporan Cerapan Hilal Syawal 1425H anak bulan yang paling muda kelihatan”