On the Cause of the Non Appearance of Certain Periodic Comets On Their Predicted
On the Cause of the Non Appearance of Certain Periodic Comets On Their Predicted
Jessica May Young
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247. The work of Berberich is a very precise* detailed piece of work. Ke first makes an independent investigation of the comparison . Stars including their proper motion. Then with the second set of elements computed by himself he computes an ephemeris covering the whole interval of observation. The observations are listed chronologi- cally and the residuals show the difference between the observed places and the places as computed from the ephemcrie. These obser- vations are weighted and group...ed into twelve groups and the weighted mean residual formed for each group. With these weighted mean reai- ) a . Oft I A : -*r ml T '. 'S'A '. -v : ' "' ' l ^ >-i 9 *& liJ" 1Hfi^ '81 *t& itJi nirUlw i: no warier-': ; . 1O I4MMR 11. duals and positions from the ephemeris 12 normal places are formed. The perturbations in
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