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Tbh is lhe hain rcason bcbind @nsidedng Age of Moon s not a vcry good indicabr for<br />

dt visibilily of cF56t. In sprinS.nd Mm€r vcry t$utrg.ge cltg cd h. sn lnd<br />

dudng th. {ullmn and *inle6 very old clescent may .scape sighling in th€ holthern<br />

hemisphed. Thc situalion is rcveB.d s6odlly for de sud@ hmisphec,<br />

whcn lhe M@n is wsl of fte sun (el6rial <strong>lo</strong>ncnudc or rh. M@n is noc rh&<br />

$ar ofdre Sun) i. our sky it is Old Moon carching up wilh rhe Sun. The Old Cre$enr can<br />

b. en in lhe mominss befoE lhc suriF. An r $e binh of Ncw Mmn (c.leslial<br />

<strong>lo</strong>ngilude of rhe Moon b*omes jusl eratd lhe rbat of lhe sun) rhe Mooi Eehes e6r<br />

oltheSun6dcan no$ b. *njustaftssun*t. How.vn dcpending on ih. d{limrioB<br />

olrhe Sun and the Moon and lhe <strong>lo</strong>calion of$e observer $e new cBcent My et well<br />

bcfoE thc sunst in which cG it is iDFssible <strong>lo</strong> * th€ ncr crsceft Th8 the fisl and<br />

rhc Do$ nnporLnr clilerion aor lhe visihility of the .ev.$ccm Moon is ftar the Moon<br />

*$ an€r $c sunscl. Alknately $c cnbrio. for thc visihilily of thc l5l cd$ent is dDt<br />

rhc Moon riss before lhe suni*.<br />

Whcn thc cresent is very c<strong>lo</strong>se ro th€ sun il rcmains invisiblc dE to the facl tbar<br />

$c ohospherc c<strong>lo</strong>se to lhe sun remains highlt illnminated evcn afi( $e sunser'<br />

Thqefoe fi.rc n6 to be a frininum lhrcshold epaEtion or E<strong>lo</strong>ngarion between fic Sln<br />

,nd rhe Moon b.<strong>lo</strong>N vhich ihe crecent cannol be sen. Thh minimud o. lhrshold<br />

e<strong>lo</strong>neation varies hotuh to oond 6 fie djsrance bctween lhc Earlh and $e Moon keeps<br />

valyine. Vhcnc<strong>lo</strong>ssl (at apoe€e) $e Moon h tround 350000 kn lrom thc Eanh ind !l<br />

lhe fdhat (perig€) il k aound 400000 <strong>lo</strong>. Thus a Ne\ Mon ar apogec mat be *cn<br />

whennscbnsation fod rhc Suh is snallrnd a New Moon at periSce may nol b€ s.cn ar<br />

nuch ld8cr e<strong>lo</strong>ngaton. Thi. is du. ro the fst that c<strong>lo</strong>ser is thc Mmn the lars€r dd<br />

brigbler ir appead in oui sky ahd wheo il k farrher il appeaB saller and less biShl at<br />

rhc se e<strong>lo</strong>ngalion. Thts .nother inpona crir.rion is lhar $e New Mmn cm be *en<br />

for a combinorion ofcenain optinlm valu.s ofe<strong>lo</strong>ng ion and lhe distanccof$e Moon<br />

fom fi. E.nh. thi! conbiMlion Esults into tlE op(nm valu€ of thc widlh orcFv€nl<br />

A cFsenr wi$ small €<strong>lo</strong>ngation $al appea6 lare.t md briSller al apogee may be seen

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