Visibility of Luna and Lunar Crescent

lonSitudcs. At uivcrssl rime 12 - zT wilt b. a dn€ of 0E se darc in O@wich s Ih.
loql dae. Th. rime dgu. for $is rine ed date is rhen fomulatcd dd th€
coordiMtes offie sunar.obaincd. wlm m objdr h in rmsil irs hour dgtc (HA) is
zo ed its dsh ecdion (RA) is se s ln. Loc.l Sidqdt Tin. (LSn siNc:
p.? l)
As3Ming dar lhe obj*t hs r{A - a !r da rine of t@t Fa6n e.7,I ) shos thal:
d= LSTt
If JD is rhe Julie ddc for $e dly ar d' UT 0En wnn , = eD _ 2451545y36525
mcaur.d in Julian centuri6 lh. c€enwich Mqn Sidc,@l Tide I, {CMST) b siven by:
4 =6141-50,.s4841+8640184'.812866.r+0'.093t0,t.r: _0,.000006rr,r
(2.7.t)
Thch for the observer ar rhe pla.e vilh eeographic lonerrude , (negative fo. west
lonenud.s a<l posirive for rhe con) rhe ccnwich sid.rea! lme ot r,asit is:
csTrr=LsTtr_L
(2.7.4)
And lhe SideEat fme elaped siNe rhe OL UT of fie dar. is,
T,=CSTtr_To
(2.7.5)
This rim. is rh.n converrd b lh. UT by:
UTU =Tlt.0Or?l?909175
(2.7 6)
59