Visibility of Luna and Lunar Crescent

$.t%'sr'(sfl + dI'.,)
(r25)
Tb vdB 6f tb.ootM v- r; ct, d!o8 eitb |b ot a'. G Sivto i! Chr.od-
Tout.d Ct q.od (Clg!d.To@a.nd Ci{.Gi, l9l, rp a!-56}
Ib gcoc.nttc ldhde UL riE b,:
t/-s,, +(s:/ +r'$ +i's;/10000)/100 Q26)
s,, .5,"si,'(rj". p:".,.p:!.rr xron +/i",r xr0r +r'r 'r'
x ro ')
s:, -'u.,&4fri.t + p{t. tl
Q2.?',)
e2.8)
.$ -tr:$4i:o +r4D.,) t229'
q.t!;&,(r;o +r'o.,1
Q2.tO)
Th! y.lG of th c@trt ! t
- !; .iq dotE eilh lho.c of 0!.t 8lt'.! in Clqlot'
Toudsrd Ctar@r (ct Fld-ToEald ftlnfi, 1991, I? 5?{a).
rindly tl|c geo.6tic dllt n6 it dven by:
x-315000.57rsr +sl +r.8i +y'.s;/10000
Q2.rD