Visibility of Luna and Lunar Crescent

Sm p.r.[d lo lqldo. (difrcqE of ddr dgii L!..dioB), tlE !sl. of d@!n
(dife|i@ of a|lnuda o. ARCU !d ri€ tid[ ofs€c.'n the M4lin aslorcEcrs
$@ aU. to develop ! hisltly rdi.ble qilcion for tlE visibilry or invisibihv ofrh6 @
Figua (l.1. I ) bclow enicl ir r r.otuttu rin offg@ 4t ofBtui. ( le77) shovs
tl|st dF sD IEs jur !.r sin of r/t{. Thc liie \nX D85rg tb.o{8! $ts drllal poilt
W, is th€ e{uror irclined d o dsL g (tlE ldihd. of lhe ple) fim tlE @rnd to rhe
horiar AS k th. dimd pdn ofth. Sun !h!t is p66llel lo thc.qualor is shom as
broko 1i... TIt diurnrl BIh ofd. Md MZ is tls sboM wnh 3 3imilt trot€.linc
Ddrall€l Io ih. .qudor. TIE lin. HS ir tL E lipaic lh.t drd e .ngl. A wfi th€ diurol
path of 6e Su d $..qulor ThBtL FiiiFb D!l6.td..8L q + d witl the Mnrl.
MS t th. s.r.r.dd b.'ra rlF Mdn !d ttr Su (e of liSln).
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Fig No l.l. | : Trigmrdic ddiFin of @rdni@ of w luE d6ern