Visibility of Luna and Lunar Crescent

rh*.@rdin l€s @ c.bdat.d th. etr€c1oftuhio. dd the sidd.d tihc coftspondins
10 zdo hou uiversal tide, for the dat€ consideed. are calculted using the tuncdois
,ttttid ad srl_tiw, E#iv.ly, The infomatioi/d.tA thu fe Scn nted is displayed
od *'€.n usins rhc t$aiqs ouinlo, rtbpt t scootd (.@fitn^.s of 1he su.) ed
dbrldr_n rord (coodinatcs of tbe Moon).
Finally, fhc tunction nainrcutir. crLtl^r.s md dbplaF on $en aU rhe
visibiliiy parmetcrs dircused in pFiou.rricle (2.8) &d lisred ss l0 to 16 dd 2l
abov. in lnc clm anicle. O$d pffi.r.c (l7lo 20 dd 22 1o 12) re @mpui.d in
orher functions (r? to 20 in tunction r@r_cMtt a\d 22 to 32 tt liM'si\ brl
display€d alo.g with these pdmet.rs. All thc Ddmd.s lisbd as I lo 32 d€ wiren lo
the outp dda file J.r"8ear in nmloulrro4, (pam€rs I to 29) ed tim._nnse
(p@ncle6 30 to 32), Tle tundion /ltr,r,,? is ih€ reproducrion ot Scba.fer's pog,aD
(S€hs.fer, 1998, Bogd, 2004) lor delediiirg th€ liniting hagnitude of dy point of
The Esl of the functions used in lhc pregrm aE lisLd dd briety dcscibed
/.ar.r..l chects lhe1hd the y.e u$d is lcap yed (ac@rdi.8 ro crcsorid
rule) or rcr? lfrhe yd is lap lhc tuncdon rerums I orh€fli$ O.
.orwt_r'ru convens an eelc inro dcgres, arc minutes do arc *cond3.
.,,rzt_rtu convens lime in hours into hoE, ninuIs &d s*onds.
hodlw Btms rh. @jnd.r .ff4 dividing th€ inpur b, 160. 6is fucdon
pamt
h 6ed ohain 6e mst. in the tuB€ 0 deercs b 360 degE6.
calculat s rh. afr*tl ot psrlts in i8hl acEion ad decu.adon
to cct th. ropcdFic ddr as1fuion 6d d.ctinarion and is bas.d
on step 8 of alsori$n in anicte 2.5.
itr._r.. rhrcud ,rr.-do, ,nd d"c_sc thrcugh d.._r,,: Ttcs. tundions altows
chdging tine (al ld.b ofhourr ninure ad ssnds) and dare
(at lev.ls ofdale dd honrh).
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