On the annual term of the latitude-variation from the Lyons observations

1895 ◽  
Vol 15 ◽  
pp. 60 ◽  
Author(s):  
S. C. Chandler
Keyword(s):  
Latitude Variation ◽  
Annual Term

scholarly journals Kimura's Z-Term and the Liquid Core Theory

1972 ◽  
Vol 48 ◽  
pp. 189-191
Author(s):  
Yasujiro Wako
Keyword(s):  
Polar Motion ◽  
Liquid Core ◽  
The Earth ◽  
Core Theory ◽  
Latitude Variation ◽  
Annual Term ◽  
Phase Angles ◽  
Theoretical Results

Kimura (1902) pointed out that there might be an unknown cause other than polar motion which would produce an apparent latitude variation, and introduced the Z-term as, Δϕ = Xcos λ + + Ysin λ + Z.The theoretical results by Jeffreys-Vicente (1957) and Molodensky (1961) have shown that the effect of a liquid core of the Earth may increase the coefficients of the semi-annual solar nutation term (2 ⊙) which is involved in the diurnal nutation (the so-called Oppolzer term) by 0″.02. It is reasonable to accept this correction which will appear in the Z-term with an argument of (2 ⊙ −α).From comparison of the observed amplitudes and the phase angles of the annual Z-terms derived from the ILS data, it is concluded that the argument of the principal annual term in Z is (2 ⊙ −α) and not ⊙. The following results were obtained for the annual Z-term for 1955-1966 from the analysis of data by two independent methods (Wako, 1970): 0″.0137 sin (2 ⊙ −α + 2°.2), 0″.0203 sin (2 ⊙ −α + 4°.3).Melchior (1970) proposed another effect of the Earth's liquid core for the annual nutation in obliquity, thus a term such as a sin (⊙ +α + A) would appear in the Z-term and it might cause a part of semi-annual Z-term. For the determination of these corrections, analysis of Kimura's Z-term is the most effective method.

Non-Polar Variation of Latitude

1972 ◽  
Vol 1 ◽  
pp. 93-101 ◽  
Author(s):  
S. Yumi
Keyword(s):  
Polar Motion ◽  
Polar Coordinates ◽  
Normal Variation ◽  
Latitude Variation ◽  
Local Trend

ABSTRACTAnalysing the residual latitude of the station, local trend in latitude variation other than by the polar motion was found.Residual latitude was calculated for each of 26 stations which gave the continuous records of observation during 6 years comprising — 1962 — 1967 as a difference between observed variation of latitude and – normal variation calculated by the polar coordinates Iderived from all the results of 26 stations.As far as the results during these six years are concerned, local trend at any station it seemed to be expressed in terms of 3λ.Assumed effect of local trend on the coordinates values of the instantaneous pole is also discussed.

Spread-F and the Latitude Variation of Occurrence of Whistlers

Nature ◽  
1961 ◽  
Vol 189 (4760) ◽  
pp. 215-216 ◽  
Author(s):  
D. G. SINGLETON
Keyword(s):  
Latitude Variation ◽  
Spread F

scholarly journals The Long-Term Effects of Long Terms – Compulsory Schooling Reforms in Sweden

2019 ◽  
Vol 18 (6) ◽  
pp. 2776-2823
Author(s):  
Martin Fischer ◽  
Martin Karlsson ◽  
Therese Nilsson ◽  
Nina Schwarz
Keyword(s):  
Gender Gap ◽  
Labor Market Outcomes ◽  
Instructional Time ◽  
Long Term Effects ◽  
Compulsory Schooling ◽  
Market Outcomes ◽  
Term Length ◽  
Annual Term ◽  
The Impact

Abstract We evaluate the impact on earnings, pensions, and further labor market outcomes of two parallel educational reforms increasing instructional time in Swedish primary school. The reforms extended the annual term length and years of compulsory schooling by comparable amounts. We find striking differences in the effects of the two reforms: at 5% the returns to the term length extension were sizeable and benefited broad ranges of the population. The compulsory schooling extension had small (2%) albeit significant effects, which were possibly driven by an increase in post-compulsory schooling. Both reforms led to increased sorting into occupations with heavy reliance on basic skills and the term extension reduced the gender gap in employment and earnings.

scholarly journals Comparisons between Results of Polar Coordinates Derived from Time Data and Those from Latitude Ones

1972 ◽  
Vol 48 ◽  
pp. 56-57
Author(s):  
Sêichi Okazaki ◽  
Mitsuko Nasaka
Keyword(s):  
Polar Coordinates ◽  
Time Data ◽  
Use Of Time ◽  
Annual Term

Computations of the polar coordinates are carried out by the use of time data and of latitude data separately. The results from time data and those from latitude data are proved to have mutual differences in annual term in particular. That is, polar loci obtained from latitude results give almost circular forms, while those from time results give elliptic forms elongated rather seriously on the X-axis.

Modification of Talcott's method of observation for latitude variation

1965 ◽  
Vol 77 (1) ◽  
pp. 237-247 ◽  
Author(s):  
J. C. Bhattacharji
Keyword(s):  
Latitude Variation
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