Visibility of Luna and Lunar Crescent

r is th€ equrorirl ndiu5 of the Eard,
dd ., is th. pold mdids of the
E nL The resl of thc calculatiohs for rhe irlnsil, rising ed lhe stling of lhe Moon arc
th. se d 1hat for thc Sun.
2.8 I{EW LUNAR CRESCENT VISIBILITY PARAMETERS
A nunber ofpdrameleB have been corsidered imponanl for deteminin8 *belber
the new cr€$ent would bc lisible al a lcaiion oo the Eanh oi ool. Tbese weE briely
di*u$ed ad lblcd in thc b€eimins of chaper l. Once tr tiD. of th. Binn or a
paniculd Ncw M@i or th€ conjucrion hs ben delmined a numb.r of p,@eGB @
rquned to h€ d€t mincd. Th€* includ. (i) Tinc of Suroet T". {ii) Tinc of M6Mr T..
(iii) LAcTn - Ti (i!) Bcs| Time orvisibiliry Tr,(!) Ase ofrh€ Moon ar Tb. AcE. (vi)
Arc of visior ARCV, (vii) Reladle Azimulh DAZ, (viii) Arc of Lishr (Elonsatioi)
ARCL. (ix) Ph@ ofcr€s.nt P, md (x) width ofcrcsent w. In vhw of the di$u$ion
ofth. s&onomic.l alSorirhns ed rehniqud in tbis chaptd the* circmst nc6 de c-
co$iderEd ro .xploE compurdiom of vdbN psm€re6 $al e inponmr ao. $e
lnolysis of l@al visibility oflh€ ncs lunr cr.$nt on $e day ofconjuhdion or d. doy
The fiBl of th.s paludd ii rh. coiju.tiotr of lhe M@. wnn ihe Sm or tn.
rime ofBinh ofNcv hootr. The alsdirlm for lh. conpuraion of (his tim. w6 pE*nl.d
in anicle 2.3. U3ing $is algoddm thc riic of g@centic binh of lhc Ns m@n is
obtain€d. The algorilho tates yee s input and giles lhe Julian datc oflhe tine of the
binn ofnew boon. Il is imporrmt ro nole $ar the i.pur iiy€ai is ior a whole iMbs, it
is o Eal nMb.r €alculat€d on the bdb of lhe exp€cled dale of th. New M@h. For
insran@ the Nry M@n in $e nodn ofApri!,2007 i. dp.ctd msd l7s d.y of thc
,e0 = 2047 +atJ0+t7)/J65
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