Young, Charles A. (Charles Augustus), 1834-1908, Young, Anne Sewell, b. 1871., ed · Boston, New York [etc.] Ginn and Company · leaf 226
it will be remembered, is the difference betweenthe longitude of the planet and that of the sun as seen from the earth,and is determined for any given instant by means of a series ofmeridian-circle observations of both sun and planet covering thedesired date. 299. To find the distance of Mars, for… … Fig. 76. — Determination of the Distance of a Planet from the Sun. earth was at A at the first observation, then at the second shewill be at a point, C, so situated that the angle ASC will bethat which the earth will describe in the next 43^ days (thedifference between 687 days and two complete…
Astronomy · Constellations
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