. American horological journal, devoted to practical horology. American horological journal, devoted to practical horology . of the equinoxes. In Fig. 3, the 1 also de»Fig. notes the same point as in Fig. 2; the truelongitude is then measured by the angle 1, S,P, the mean longitude by 2, C, M—to find thereal place we have recourse to the equationof the centre. By inspecting Fig. 3 it will beseen that the two longitudes (the true andmean) can coincide in two points onlj-, P andA, the apsides or extremities of the majoraxis, the true place being at every other pointof the orbit, either befor
. American horological journal, devoted to practical horology. American horological journal, devoted to practical horology . of the equinoxes. In Fig. 3, the 1 also de»Fig. notes the same point as in Fig. 2; the truelongitude is then measured by the angle 1, S,P, the mean longitude by 2, C, M—to find thereal place we have recourse to the equationof the centre. By inspecting Fig. 3 it will beseen that the two longitudes (the true andmean) can coincide in two points onlj-, P andA, the apsides or extremities of the majoraxis, the true place being at every other pointof the orbit, either before or behind, inmoving from A through the arc A, P, true place, P, is behind the mean place,M. Following the whole revolution, it willbe seen that in the opposite arc, P would beahead. Now, half the sum would be themean place of the bodies at any given true measure of the equation of the centre, AMERICAN HOROIiOGICAL JOURNAL. 71 then, is the distance C S, which is also themeasure of the eccentricity of the orbit whenin quadrature. It follows, then, that theplace of a planet in its elliptical orbit is ob-tained by adding or subtracting the equationof the
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