By Wm. Markowitz (auth.), Wm. Markowitz, B. Guinot (eds.)
AGU American Geophysical Union BIH Bureau overseas de l'Heure FAGS Federation of Astronomical and Geophysical prone lAG overseas organization of Geodesy IAU overseas Astronomical Union ICSU overseas Council of medical Unions ILS foreign range provider IPMS overseas Polar movement provider foreign Union of Geodesy and Geophysics IUGG PZT Photographic Zenith Tube UNESCO United countries academic, medical and Cultural association advent The speculation of continental flow has develop into of accelerating curiosity to geophysicists in recent times. The IUGG top Mantle Committee has acknowledged that the speculation of continental float envisages horizontal displacements of the continents over th- sands of kilometers, and that it's a crucial target of the higher Mantle undertaking to turn out even if continental float has happened. The foundation of the speculation might be traced to the shut similarity in outlines of the coasts at the facets of the Atlantic Ocean. the idea that the jap and western hemispheres are drifting aside was once expounded particularly through A. Wegener. glossy geophysical theories search to provide an explanation for paleomagnetic observations by means of - suming that issues have happened some time past: (a) large-scale polar wandering, and (b) continental float. a right away affirmation of glide, if it exists, is tremendously wanted. makes an attempt were made to end up that continental glide has happened from - served alterations in range and longitude. It used to be proposal via a few, actually, that such adjustments have been detected.
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Additional info for Continental Drift, Secular Motion of the Pole, and Rotation of the Earth
Change of Spheroid When detached surveys are computed with different spheroids and origins with (inevitably) different centres, a trustworthy common point makes it possible to reduce the latitudes and longitudes given by one into terms of the other. If the two surveys have parallel axes, the conversion is simple. If they have not, it is less simple. 9. Star Catalogues Random probable errors, when brought up to the present epoch, are estimated to be of the order 0':2 for FK4, 2" for the Boss G. C.
The results are shown in Table 3 and Figure 4. 5. r. r. 1;. The results are given in Table 4. 6. Discussion and Conclusions The secular variations of longitude differences for various combinations of observatories as derived from long intervals seem to be significant, considering their mean errors. However, when we divide the data into two periods, very different results occur. The same situation appears for results from the recent, precise time observations. SECULAR VARIATION OF LONGITUDE 51 Regarding these circumstances, it is hard to consider that the observed secular variations of longitudes are due to continental drift.
9 +2·26 +2-61 + 1·16 -1·76 -0·46 -1·30 ±0·63 ·97 ·49 ·41 ·62 ·86 -1·64 -0·39 -0·48 + 1·23 -0·09 + 1·32 +0·81 ±0·39 1·01 +1·65 -0·57 ·51 -1·38 -48 -2·22 1·06 ·83 +0·84 1937-49. 0 FrG. 2. Secular variation of the difference in longitude; results (a) and (b). ±0·24 ·45* ·35 ·29 ·49* ·46* 48 M. TORAO, S. OKAZAKI, AND S. ::::. ,;: -w·~ r To-Es 0 v· ,... t't>.. ~ A ~ Go .. ~.... ~ • I I I I BArEs t-~. JV"~v. 0 FIG. 3. Secular variation of the difference in longitude; result (c). Table 3 Secular variations of longitude between nearby observatories, from recent data, 1956· 8-1965· 5 Sec.
Continental Drift, Secular Motion of the Pole, and Rotation of the Earth by Wm. Markowitz (auth.), Wm. Markowitz, B. Guinot (eds.)