Visibility of Luna and Lunar Crescent

t
0.0 < .1R,. < 1.6 p8tbiti,tr o! ,hltw o! Ji6t M@nt btrh ond withoul
optt ol h staq !o, tigt.r tdlituds. Lo.a!|rA N6t tuith opticd! a ! a".!
th.a try nelnE lt Nlth haL.d e!. h6 a eood .ranc. o! opticdlr u"tided
ne,> 1.6 th. pNtlbnrr oJ' tbi!i!, oifust cnse wtuhout optcat t st ona
Jor bo& Iow.r and highu tatttud.t,,
Another way oI lootjng inio ih€ delaih of Lue Ripene$ hodel is lo look inro
the plots ofaverage ripehess fmcrion md rhe acod ,ipenes tuncion for borh vhibh &d
invisiblc crcsei$ for single talirude, U.forluarcly, rhe dru avaitable dd considercd in
lhis work h Esrficlcd in rhc F6e lhat scieltifically re@rded ob*dalions fo, a sinetc
hnud€ a€ nor found lery fr€qucnrly €xcept tor Athens (ladrude 38 dc8,as .orrh) ed
Cape Tou (laritude 13.9 degr4s so!rh). !n panicula, for sn,I€r tatitudes. plac6 cto*
IoequarorobseruatiouarelolvcryfFquenuyav.ilable.Anunb€rofplaccsecsetecred
herc od tbeir d.h pto(cd for Alerage Ripenes Fundion &,, and the Acllal Ripen*
Fuiclion R6y for borh rhe Eponedty inlisibte dd the vilibtc oe*mr! Thesc jnctudc
plees with laritudes L8N, 33 95, 6.5N dd 38N (FiguB 3.3.6 1o 1.1.9).
Figure 3.j.6 for tadtude 3 L8N snows tbe b€sl slc
sieh,incs ou, of 6 (83.37") in asrcen€ wnh $" ,_J:'iff:ln:"11,'#:J:
obscdat'ons (6 our of6) e in agrccm€nl wilh the ta* toi this larilud€. Nexr is Cap.
'rown-(hnnde
ll.9 S) wirh succcss percenhgc 65% (ll posrlire siehings in sgenenr
od, ol 20, the needrvc obseryauons fo, Cap€ Toq are In agrehenr sirh la\ tor
9lJ% c66. This 6 ao owed by ,40r.6 (ladrlde 39N) w,rh 2 oul of3 {66.7910) posirivc
eghlingsad II o of l8 (61.l%) neSariv€ sighdnes a8rce snh fic lav. Ior laritude 6.5
deg!.es, I our of2 (50%) posilive sightings od 4 oul of6 (66 ?y.) asE. wirh rhe tan.
I05