Bandar Seri Begawan – The western horizon was generally pretty clear and Venus was visible late afternoon yesterday (Jun 14, 2018) , but it was very windy and cloudy (from altitude about 6 degree and below) near the horizon where the moon was located in the sky.
Bandar Seri Begawan – The official first day of Ramadan falls tomorrow (27th May 2017) in Brunei Darussalam as the moon crescent of Ramadan was sighted by the officials (of the new moon sighting committee) in this country.
New Moon Visibility Computation for Bandar Seri Begawan Continue reading “New moon visibility and properties for Ramadan 1438H from Brunei Darussalam”
Bandar Seri Begawan – July 05, 2016. A group of members of the Astronomical Society of Brunei Darussalam was at the Agok Hill in Tutong for the moonsighting to observe the new moon of Syawal 1437H. The western sky was partly cloudy especially new the horizon with the sun set behind the clouds on that evening. At about 15 minutes after sunset, at the clouds break, the 24 hour old hilal was firstly visible through telescopes and CCD Camera at around 6.52 pm. Continue reading “New Lunar Crescent of Syawal 1437 seen from Brunei”
Tutong – April 19, 2015. Almost despaired by the weather as the western sky was partly cloudy when seeking the young moon at Bukit Agok this evening. The sun set behind the real horizon of which very much assisting our telescope alignment and had given us hope indicating for a clear hazy patch in the sky. Sunspots were visibled through a 100mm f/6 refractor attached with a solar filter when the scope slewed at the sun.
After sunset, at 1827, the scope was pointed to the Moon revealing its location which was behind thick clouds. However, there was some opening in clouds about 1 to 3 degrees just nearly above the horizon,
At 1852 or 25 minutes after local sunset, the scope was pointing to the cloudless area, very low in the west horizon. At that instance, the super-thin young lunar crescent of Rejab 1436H was firstly appeared through the telescope. Even so, with optical aid, the Hilal (crescent) was hardly seen to the eyes as it was washed out by the twilight. Not until 4 minutes after that, the crescent was visible to the naked eyes through the viewfinder.
The new Moon sighting was conducted by Ustaz Saifulbahri and Hazarry of the Astronomical Society of Brunei Darussalam. This afternoon’s sighthing was a new record set for the youngest Moon with age of 15.8 hours old ever seen with optical aid in Brunei. Previous record was a 19 hours old observed in November 2004 (here).
New moon data:
Awal bulan (7) Rejab 1436 :
Ijtimak awal Rejab : …
19 April 2015, jam 2j 59m 20s (GMT: 8)
Lokasi : Bandar Seri Begawan, Brunei
Pada hari rukyah,
29hb Jamadil Akhir 1436 = 19 April 2015,
1.Matahari terbenam: 18j 26m 45s (GMT: 8)
2.Bulan terbenam: 18j 59m 46s
Ketika matahari terbenam:-1.Altitud bulan: 7.59° (7° 35′ )
2.Jarak lengkuk: 7.59° (7° 35′ )
3.Azimut bulan: 281.26° (281° 15′ 28″)
4.Azimut matahari: 281.17° (281° 10′ 25″)
5.Susulan lama: 0jam 33minit 00saat
6.Umur bulan : 15.46jam
7.Peratus cahaya (fasa): 0.65%
8.SD : 0° 16′ 21″
9.Jarak bulan-bumi : 364891 km
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 firstname.lastname@example.org