Visibility of Luna and Lunar Crescent

a0
50
20
Fi&No. 1.1.5. i^fore=61 50
Howev€r lhe narcr i! lrot $ sinplc beca6' tuc olc of latitude of rhe cKdt'
i-., whcth€t thc cc$eni is !o!ih or north of ihc Sun plavs e impona role lhai
dercmin6 rhe v.luc ofrtdo lhal is lronglv btnude dcFndst Now lh' stDns nuimum
at lhe v.oit .qrinox for hi8h.r lttitud6 indicat's thtt e old'r M@n rov rc1b' vbibl'
b s the AGE offt. Mo@ iNrrsd $ do6 iG elo'sdi@ ad brighlress ThtebE n
is posibL ftat invisibilitv $g86l.d bv $' Rrpcnas tun.lid valucs m'v b' nisleding
Thh inly l.!d lo ltlollN for sdalld LAG vd6 drd sm lqr€lEof x'L h rlnt
$!d( th. RiD.G$ tulcrion vtl@s for dE ob!'dltioml dab avlilablc in lilettrurt e
.dculacd sd pr6.ntcd in ApFndirlt Out oflhis dx' s't th' c!56 whd thc cscenl
s Eporr.dly sd bui .rc nor h lg.mdt *nn dE L|M RipGs ltw rE also s||os
in nblc rc. 3J.1. TtG obae liontl dah k $lccLd AoF lh4 tPo :d bv Od'h (Odeh'
;0{a) fron *hich c.*s or cvdi!8 '6cnr
obs'naiioN re cosidercd onlv Ttblc
3.1.1 shows o. No. (th. oberysti@ nunb'r (Od'h' 20Oa))' dtt' of obseNttion ldnud€
,ftt longin/. of ih. t@dron of obaa$s' M@n\ !8e and LAG' snele v of ecliPlic sitt'
rrorLo, t"lio,a" or Uo.,, toogirudes oI the Moon ed th' 3d' Rd giv'n bv (13 12)
*ill !6 siv@ bv (3.310), Re siv€n bv (3 3 12) *ith 's
= 10 5 d'8r*s' Ri' sircn bv
O.3.I l) and a&. = Rdq - &"
I