A treatise on gyrostatics and rotational motion . ars. The difference from the mean latitude for each stationis equated to the form #cosA+ysink+i for each ,n year, where x denotes the move-ment of the pole on the Greenwich meridian, and y the movement in the perpen-dicular direction. It will be clear that for two stations differing by 180° in A, cos A and XI FKKK ICTLERIAN PRECESSION ?2-.\: sin A will have opposite signs, while if A differs by .,- at the Btations, the A +//siii A. at will correspond t .rsin A+ycos A al tl ther. The term ha caused a good deal ol discussion : ii is belie
A treatise on gyrostatics and rotational motion . ars. The difference from the mean latitude for each stationis equated to the form #cosA+ysink+i for each ,n year, where x denotes the move-ment of the pole on the Greenwich meridian, and y the movement in the perpen-dicular direction. It will be clear that for two stations differing by 180° in A, cos A and XI FKKK ICTLERIAN PRECESSION ?2-.\: sin A will have opposite signs, while if A differs by .,- at the Btations, the A +//siii A. at will correspond t .rsin A+ycos A al tl ther. The term ha caused a good deal ol discussion : ii is believed t be due partly in meteorological causes.*The results are given in the Resultate dea Tnternationalen Breitendienstes published by iIh- Zentralbureau der Enternationalen Erdnicssung, Berlin.+ 13. Diagrams and tables of later results. Albrecjats diagram of the motionof tin- pole for the five years 1890 ; is given on p. 15. It is repeated here for com-parison with his diagram for the six rears !!) \\)\-i, whieh we also + 0-3 + 0-3 -0-3 + 0-3 + 0-4 Fig. 62. The following^table kindly supplied by the Astronomer Royal, Sir Frank Dyson, givestie dates of maximum variation of latitude for Greenwich during the last twenty years : 1897-2 II 1907-8 1-2 8-3 1*2 9-0 1-2 9-5 PI 102 L-] 1900-6 ]•:. 11 -3 11 21 i-o 12-1 ri 31 1-2 13-8 1-3 I :: 1-1 15-1 1 -i 15 .VI I-o 16*15 G-4 P2 The differences in the second columns give the intervals between the sueeessive mean interval, it will be seen, is P172year, or 128 days. •The z term is discussed by II. S. Jones in Thi Observatory, Feb. Astronomischi Nachrichtung, 192(1912). 238 (iVROSTATICS CHAP. XI The curve of Fifif. 63 shows the variation of latitude at (rreenwich for the interval from1911*7 to 1916*0. It will he seen that the interval of 4 years and 3i months includes
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