A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 165
on centre of gravity of the two bodies whichdescribes around the sun the ellipse which we have called theearths orbit, and since the earth and moon revolve around thiscommon centre of gravity once a month, it follows that this monthlymotion of the earth Causes an alternate eastward and… … but when the moon is at quadrature (that is, 90° from the sun, as at the time of half-moon), the sunis apparently displaced in the skyMjoicards the moon, as is evidentfrom Fig. 78. It will be about6.3 east of its mean place at thefirst quarter of the moon, Fig. 7H(B), and as much west at the timeof…
Astronomy
Internet Archive · Wellesley College Library · Public Domain Mark 1.0. Free to use for anything.
