Visibility of Luna and Lunar Crescent

In cae ofMoon nonh ofediflh:
DAZ ! ES = EJ J JS lassine
es I
-elr
@te
{r.4.r)
and c4c ofM@n soulhof(tipric:
'n
o,lz - o5 - p1g , 115
= o, *6s - 6n
(1.4.2)
"in, cos p
DAZ siven by (l.a.l) js much sfraller $& rhar eivcn by (1.4.2) for th. r.son tar in
(3.4.1) rhe difirEicc of dqliiatioD of rh€ Sun qd rhe M@n (\ _ 6M) is sna er
rr{ |han
in (3.4.2). wnh k4er aRcL (SM') for M, (3.4.2) as compared |o M (1.4.r) &ry j,
rar8.r bul &[ or Rd. is sdc. Ahhongh A&,i (Ra, - &ryJ r sme tdr the two ca$s bur
crc$cd al M. is older, rhick.. and brighrei mucb soaler rhan for M. Esutts into
dill.Enr ofarcs oftishr (ARCL) or older cE$eit with large! ph6e. Thus in case of in
case ofM it hst be difijcult to ke the crescqr s conp&.o ro rne c6eofM..
When€ler as is v.niet (perpodicuttr to rhc horiz!) DAZ vanish€s
optihuetud
aidnioo of I Oo (when Moon is ctosesr !o rhe t dnh) b l2v (,hen f.nhd lhe M@i
frcn is
rh€ Ea.rh) ccu_ As and whei tu i; nor v€niet lhe ol. DaZ coh€s
play
inro
lnd Oe oplimum condiroN for as ca b€ retded. For hucn ls8er valu€s of
4d DAZ
older dd wjder cesc€nr may b. visibte wirh s@ er vahca of ARCV or aD. So rhe
oodels inlolvine ARCV-DAZ rclarions comc into play. h these hodel ARCV is a
runcrron ofDAZ so as should aho be a fuction ofDAZj
4,. = 4.. cosa ad ARcy = ftDAz)=aL
- -[(DAZ)
(J4.3)
Il0