Visibility of Luna and Lunar Crescent

DE to lh. nodotr of thc ob6*d. th. diual .nd lhe mual motior of thc Eatth.
poiilior of €E.y objer in th. sky is afrctcd by 0!. phcmmn of Abcmdon- Th.
followinS @cid.ntion is only for rhe Eaih'Moon pls.t.ry Ab.dlion sd do.s lol
includ. the dimal nolion of thc ob6*er (W@lad & Cl.mcnce, I %6).
S1.t-4r CORREC'TION FOR ABERMTION
v-y4.000 t 9521-0.0&nl059.skQ 25 1177 198 9\) 12 5.2)
U- U-0.40001 754t31h(183 J +48J202't)
(2.s.3)
R- R + 0.0708.C6Q 2 5 + 177 I 96. 91r)
(2_5.4)
Fimlly a 1he lrue €quinox of ft. d.y and dE mcm €quinox of lhe dly de
difiedt dE ro thc phenom.non ofNuiation the F€.is cerdinab on nol be ob|dircd
without th€ nul'lion in lonS itudc AV and the nubtioh inobliquityAs.
St pS:
CORRECTION FOR NUTATPN
a'r =l0r 't(y, + y:..)'si,{/,I" +/d' '. +/d' '.r 'lo r)
(2.s.t
Y=V+ L,t 12-5.6)
. -22.63928-0 0ll\+0.555'lo' t.r -0,0141'l0j
r tl
(2.5.7)
^' =lo I 'I(., +,' '.). cdko) + /,r' . ' +rdr ..).lo 1)
(2.5.8)
(2.5.9)