Visibility of Luna and Lunar Crescent

Chapter No, 2
ASTRONOMICAL ALGORITHMS &
TECHNIQUES
For lhe determlnatlon ol th€ prsiso locallon ol the obJsts in th6 Solar
SFtem, panbulany the Sun .nd rh6 Moon, ih6 Fr€nch planetary theory VSOPaT,
(sretagnon & Francou, 1994) and th. lunrr rh€ory ELP-2000 (Chapront-Tou# .nd
Chapron!1943, €91) rr. well sulted. A number of sotlwaE hav6 ben develop€d
tor lho shulatlon of cel€stlal phenomona based on the$ th€o.16 and similar otner
works.In the cunanl studylhe same lh€ori.s havs b6.n u*d lo lollowthe pGitlons
otthesun and rhe Moon.
Moreoler, to conven the theorles Into computatlonal iechnlques,
malhematlcal lechnlques, tools and dlgo thms nave been dtloted. Moch ot the
computailon.l work is ba*d on the algorithms devoloped by Me€us (Me€us,199a)
but a subslantlal ahount or work on computatlonal aEonthms has been done
Ind€pendsnlly. For a ihorolgh und.Franding ol lhE compul.tlon.l toob the
problem of llme ls explor6d rnd discused in d6tatl. ln this 6Ebrd the @nblbution
of a numbd of authors has beon sludled in as much detail as ls required (Aokl et.
al., 19aa. Sorkoskl, 1944, Clomen@ 194a, 1957, de ,ag6€, and ,lappel (Eds.),
197l- Dl.k, 2ooo, E$€. and Parry, 1995, E3*n et, al., 195a, Gurnot dnd
S6ldelmann, 1944, Markowiu er. Er. 1954, Mullor 6nd rappel, 1977, t9unk and
lrlacoonald, 1975, Nel$n et, al., 2001, Newcomb, 1495, Sadler (Ed.), 1960,
seldehann rnd Fukqshlmai 1992, Spencer, 1954, Stephenson and Moi$n, 1944,
1995, Sleph6n$n, 1997, W€lls, 1963, otc.).