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Let
and
represent the ecliptic longitudes
of the sun and the moon, respectively. The lunar-solar elongation is defined
![\begin{displaymath}
D = \lambda_M - \lambda_S.
\end{displaymath}](img1445.png) |
(132) |
Since the moon is only visible because of light reflected from the sun, there is a fairly obvious relationship between lunar-solar elongation and lunar
phase--see Fig. 26. For instance, a new moon corresponds to
, a quarter moon to
or
, and a full moon to
. New moons and full moons are collectively known as lunar-solar syzygies.
Figure 26:
The phases of the moon.
![\begin{figure}
\epsfysize =3in
\centerline{\epsffile{epsfiles/phase.eps}}
\end{figure}](img1449.png) |
Richard Fitzpatrick
2010-07-21