Visibility of Luna and Lunar Crescent

m obddation no.274 (ARm = -1.19 ) drd 416(A&tr- -l_06) i{i$ age 14.8 sd t5.9
houE rcsredvely. Despile being lery yorS having FLlively l&aer LAGS (39.j md
17.7 ninulcs sperively) in both c&s rhe Moon ws very close ro the Eanh rcsuhine
in ldse visua.l dimcler bur lh€ cltsnl widrhs wcrc sb.ll (10_? &d ll.9 e. s@ndr
only). with $all the rclalivc eimurhs (4.6 a l.8 dese, the crcsent eas atnost
ve'liMlly abov. the su rhat bring it in ihe ided cordnion foi visibiliry bul lh€ snau
elative altitudes (8.5 ed 9.1 deele) nake rhe$ claims highly oplini$ic. Borh th6e
obse^ario6ec in d$dgreementwirh Lh€ BdbyloniM qirenon.
Out of th€ 14 positive obseru.tioi wnh A&r < O, ihte werc very f.ini cEscenrs
i.e. obsrarion n@be6 389 (d&. = {.94), 341 (AR^, = -0.87) ed a55 c0 62) The*
crscent werc low in ottitude (?.2, ?.8 and 8.j deg,es resp€dively) ed hrd sna
erongarion (10.9. 13.3 dd 9 deg@s Esp.cively), This hakes these ct6i6s lo be higbly
opr'n'strc os well. Two otthcsc {389 and 455) are sko in djeereocot viri Babylonian
cnlenon {heec 341 is a mdSiMl6e in Babylonian qirerion (with ARCV + LAC =
How€v€r, for all $ee I I 9 c6es when $e crescnt wd daoed ro hdve been sen
wirh naked eye,lhe conmo. ieatule w6 relariv€ty hi8h l&uoes {generalty g@&r thq
S0 degrres on €ilher side of rhe €quator) except fo! obFNatbn no. 416. Th€ cbim 4l6 n
tioh latitud€ 6.5 degres nonh Apan fmm rhh lonely c6e it appe&s lhat fo, A&r < O n
is ihpossible to see lh€ cE*entatpt&es witlllatirud€s less fian 30 desEes (borhNodh
Inlhe l19caksofsroup B,lhe frequency for optica y aid€dyisibiliry (botb wnn
binocula and retescopcs) ihceses ed one ce cdily g€nerau€ lhal whcn Atqr, ties
between -3,58 and O.O theE is s hjgh rDssibility of crescenr visibilhy wilh soe oprical
sid for bod lh€ high latifude as wel s low l.rilude obefres. I hereby jn this wort the
s4ondpd of rhe Modilied t\4ujlih Lus RiFne$ LaB $$Rds
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