Willson, Robert Wheeler, 1853-1922 · Boston, New York Ginn & company · leaf 167
rd longitude270°, and the direction of any other line on the map is fixed bydetermining the angle which it makes with the line drawn to thevernal equinox. Thus, the line in Fig. 81 from E to M makes anangle of 45° with the line SR, and is therefore directed towardlongitude 46°, and EJ is directed… … ^ 0 i i i 4 s 6 Pig. 81. Direction of a Line fixed by Longitude To find the Elements of an Orbit. —The elements of the planetaryorbits may be obtained from measurements on the diagram. Theseelements are as follows: a Semi-axis major of the ellipse or mean distance. e Eccentricity of the ellipse =…
Astronomy
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
