Visibility of Luna and Lunar Crescent

b.twe.'r€giotrs of v&ids vbibility condilions on lh. b.s of viribihv pdma.. ,/}
used in lhe Indian mdlDd th|t be cals 6.8tu .
Fis.No423
Fdthc bd rinc ofq.sit lisibililv' hc nor6 ih.t h fg 9 of Btuin tlE siniM
of viribilitv c!tues of , t r agaiin s lor different ges.ent widths, fom a slrsisl]t line
which whs Drcj.cl€d n€els tn orisin of the @rdiMt€ svst'm (" r) The 3{m h
shom h6e in fi8u.. 4 2 3 s a G{t lir. PNing ttroSli niiinun of @L @rc Th'
slop. olrhis saSl lin.i3(, trta/4d,rs 5/{ Itis dnimun @@sponds to lh'
b€d vilibility @dnio|\ thc b.d cerlln bd}6 rlE N6'ee briahtns ortlt d(v !fl|
the b.iShtness oa th. c..stl ..dding lo Bruin Yall@ inrdPr'tt it a 'poinr in tm'
rhNt rlivi.!€s "the tim€ lin€" beiv@ the Sunst ts ed lhe M@n!€t l, in a nlio 5 4 Thus
rhie "poi.t in tin€" i3 th. b.!i tine I, of c..s..ot vitibilitv Sivd bv:
t,=
5\ + 4\rs + LlG) ,
9
l4l
T. *!1,4c
(427)