sultan_2006
Topics RECONSTRUCTION, SCHAEFER, SCHAEFER'S FORMULA, LUNAR VISIBILITY, VISIBILITY OF LUNA, BRIGHTNESS OF CRESCENT, MOON, QAMAR, HILAL, RUYAH TUL HILAL, CRESCENT OF LUNA, LUNA'S CRESCENT, SCHAEFERS, CRITERION, REDISCOVERING SCHAEFER, S FORMULA
Topics RECONSTRUCTION, SCHAEFER, SCHAEFER'S FORMULA, LUNAR VISIBILITY, VISIBILITY OF LUNA, BRIGHTNESS OF CRESCENT, MOON, QAMAR, HILAL, RUYAH TUL HILAL, CRESCENT OF LUNA, LUNA'S CRESCENT, SCHAEFERS, CRITERION, REDISCOVERING SCHAEFER, S FORMULA
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Conclusions<br />
From the discussion above, we may conclude that “best time” for the first<br />
visibility of the thin crescent moon is directly proportional to site elevation and<br />
inversely proportional to moon altitude, at site elevation of 1000m or less the crescent<br />
could be first seen 5 to10 minutes after sunset, where at site elevation of around 2000m<br />
the crescent couldn’t be first seen until about 30 minutes after sunset. We also conclude<br />
that, at site elevation of around 2000m the optimum lunar altitude for first visibility is<br />
about 2 degrees.<br />
References<br />
(1) B. E, Schaefer, QJRAS, 29, 511, 1988.<br />
(2) F. Bruin, Vistas Astron., 21, 331, 1977<br />
(3) B. D. Yallop, Tech. Note 69, RGO NAO, 1997<br />
(4) M. B. Pepin, Sky & Telescope, 92, 104, 1996.<br />
(5) Z. A. Al-Mostafa and M. N. Kordi, Observatory, 123, 49, 2003.<br />
(6) A. H. Sultan, Observatory, 124, 390, 2004.<br />
(7) H. R. Blackwell, JOSA, 36, 624, 1946.<br />
(8) A. H. Sultan, Observatory, 125, 227, 2005.
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