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By D. Clemence G. M. Brouwer

"the suggest anomaly expressed when it comes to the genuine anomaly"

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T h e following relations are t h e n used: - = - a r (88) V\ y e sin u = a Kf> — 1, e cos u = rV 2 / = u — e sin u. (89) (90) (91) T h e m e a n daily motion is found from n = (92) Vv 2 in t h e general case, or (93) n = ka-* 12 for m i n o r planets and comets. Finally, l = l - n ( t - t) 0 Q (94) furnishes t h e m e a n anomaly at t — t . E q u a t i o n (88) is the vis viva integral (26) with JJL — 1, C = — \i\2a. E q u a t i o n (89) follows from (46); (90) results from (45) which may be written r f cos u = 1 — 0 a in w h i c h r/a is replaced by r a which follows from (83).

Consider, for example, t h e t r a n s formation of coordinates in t h e system x y, z to t h e equatorial system Xy y, z t h a t was treated in Section 20. T h i s transformation m a y be accomplished as follows: y 1. A rotation — co about the z axis, r (— co), 2. A rotation — I about the x' axis, p (— 7), 3. A rotation — Q about the z" axis, R (— Q)> 4. A rotation — e about the # p (— e). Q 0 0 cos € sin e 0 0 1 0 0 0 -sin e cos e 42 ELLIPTIC MOTION I n a numerical application, the last four matrices w o u l d be multiplied first, yielding the vectorial constants in matrix form, which would t h e n be used as required.

It is i m p o r t a n t , however, to use u in t h e evaluation of / in (91) and in the calculation of t h e orientational elements (96), (97) to t h e full n u m b e r of decimal places desired in the elements. A similar uncertainty occurs in the evalution of co from (98) if / is small, and this is carried forward into t h e evaluation of Q by (99). CONSTANTS FOR EQUATOR 51 If either e or I or b o t h are small, the use of the full n u m b e r s of significant figures in u and co will assure t h a t t h e s u m of the angles Q + to + I, the m e a n orbital longitude, is accurately d e t e r m i n e d , regardless of the fact t h a t all three of the angles, Q, co, and /, are individually k n o w n with considerably lower accuracy.

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