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The possible range arc of vision for Aphelion and Perihelion group of Hilal visibility

Authors: Moedji Raharto; Novi Sopwan;

The possible range arc of vision for Aphelion and Perihelion group of Hilal visibility

Abstract

Unique and reliable criteria on Hilal visibility is important for determine the beginning of new month in Islamic Calendar. One of possible criteria on Hilal Visibility is Arc of Vision (ARCV). ARCV is defined the different between the altitude of the moon and the sun at the time of sunset. We present our preliminary study possible criteria on Hilal visibility for Aphelion Groups (AG), is defined all Hilal member of Islamic Lunation Variant Number (ILVn) 223, 186 and 087 and Perihelion Groups (PG), is defined all Hilal member of Islamic Lunation Variant Number (ILVn) 217, 155 and 019. We find some ranges of ARCV as follows: (1) Aphelion Groups (AG): ILVn 223: 7°.82 < ARCV < 10°.87, ILVn 186: 7°.82 < ARCV < 10°.52 and ILVn 087: 7°.86 < ARCV < 10°.86. (2) Perihelion Groups (PG): ILVn 217: 7°.73 < ARCV < 10°.71, ILVn 155: 7°.68 < ARCV < 10°.18 and ILVn 019: 7°.79 < ARCV < 10°.82. Those Hilal, in the ARCV range are composed of first lunar crescent visibility after conjunction with fraction of illumination of ...

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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