Willson, Robert Wheeler, 1853-1922 · Boston, New York Ginn & company · leaf 169
tude of a planet is known, it may beplotted at its proper place on the diagram by drawing a line fromthe sun to that division of the graduated circle which indicates thegiven longitude; the intersection of this line with the orbit givesthe required place. When, for instance, the heliocentric… … Fig. 82. The Z Coordinate many millions of miles from the ecliptic, but its exact distance maybe easily found by the use of its inclination triangle. This will appear by consideration of Fig. 82, which represents adiagram in which the orbit of Jupiter has been cut through alongthe heavy line, and…
Astronomy
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