Visibility of Luna and Lunar Crescent

Laliild. ofMoon in d€8rc6,
Angle of E liptic wilh Horizon in d€8rees,
LAG, Moonkt {u6el in oinut s.
rable No 3.2.1 : posirive Ase Nesaiifr&B-;s-i66l2oliT;R;;iifr;;
3.3 LUNAR RIPENESS LAW & ITS MODIFTCATION
Befor€ |h. rin$ of ptolefry lh.rc ws no knoyn sy$enalrc descriprion ofthe
dynamics of thc planeb and rhe Moon, Theretoe pblemy,s explor.tion Che epicycle
based description ofthe pltret4y noiion) sens to be rhe tirst sciious. scientific 6d
ststemlic aucmpl to d€$nbe 1he dymics oteld systed obl*is. Muslim 6ed lhis
tyiem b cxploc lhe condidoE for 1hc fid visibility of ns lutrd cr€sce . plolemic
th€ory hal d.*rib.d th€ plderary nodon Eins rhe epicyctcs tcory rhal could Dddict
the pl4ehry, lunar .nd sol& ephen€ns to a g@d soush d.er€. of accuacy. Tne
Muslins had put ro use lhis iheory weu ond had developed sotr dnd lu.ar tables. The
pos ion of$e Sun ws predictable !o a g@d dce@ ofprccisio. and @nsequendy rhe
aele !r lhat ih. *lidic hal6 with ihc hoizon ar the line ofsue( ould b€ calculard
Bing rne sphe.ical uigoroheFy that Muslim naomddn hav€ d€v.loDed th€n*1v6.
As decrib€d by Bruin ( 1974 sing lhc &8lc of ectiplic ,y wid! the hoiizon al lhe tine of
su*! the lalitude of th€ place of obseFarion, egle of sepsauoo b€rseen Moon dd
a9