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Volume 8 (1962)
- Issue 3-4 Pages 91-
- Issue 2 Pages 47-
- Issue 1 Pages 1-
Volume 8, Issue 3-4
Displaying 1-6 of 6 articles from this issue
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Yoshibumi TOMODA, Akira JITSUKAWA, Hirokazu TAJIMA, Jiro SEGAWA1962 Volume 8 Issue 3-4 Pages 91-97
Published: March 31, 1963
Released on J-STAGE: July 05, 2011
JOURNAL FREE ACCESSIn order to know gravity anomalies at sea, measurement of gravity on islands has the same importance as measurements on board vessels. In July 1961 and June to July 1962, gravity measurement at sea around the Izu-island was carried out by means of the Surface Ship Gravitymeter, and in cooperation with these operation, gravity measurement on the islands in these area has been carried out at Niizima, Kozushima, Miyakeshima, and Hatsusima island. The results are tabulated in the table I.View full abstractDownload PDF (2793K) -
Sigetugu TAKAGI1962 Volume 8 Issue 3-4 Pages 98-101
Published: March 31, 1963
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSThe diurnal variation in the latitude is discussed on the results obtained with the Mizusawa PZT for the period from 1957 to 1960.
The conditional equation to derive the diurnal variation is as follows :
Δψi=Δψ0+Δδi+a sin 2π τi+b cos 2π τi+c sin 4π τi+d cos 4π τi+k(Cc'+Dd'),
δi:declination correction to the group i τi: unit in day.
The results are derived with two assumptions of Δδi≠0 and Δδi=0 and are given as follows.
Some explanations for the cause of the diurnal variation are made, but they reveal themselves to be poor for the purpose.
The close inverse correlation is found between the semidiurnal variation in both atmos-pheric pressure and the latitude observed with the Mizusawa PZT.View full abstractDownload PDF (498K) -
I. Method of Simultaneous ObservationsHidewo HIROSE1962 Volume 8 Issue 3-4 Pages 102-114
Published: March 31, 1963
Released on J-STAGE: July 05, 2011
JOURNAL FREE ACCESSGeometrical situation of the problem of the determination of a station position based on a set of simultaneous observations of an artificial satellite is fully discussed. Concerning this problem, a method of deriving simultaneous data based on constructing a preliminary satellite's orbit is also developed. Working formulae for the main problem together with a numerical example are given.View full abstractDownload PDF (1349K) -
Shigetaka IIJIMA, Seiichi OKAZAKI1962 Volume 8 Issue 3-4 Pages 115-125
Published: March 31, 1963
Released on J-STAGE: July 05, 2011
JOURNAL FREE ACCESSA new method of determining the instantaneous pole's coordinates of the Earth from the data of time observations is described here, and a calculation after this method is made with the data of international time observations for eleven stations which have kept good time observations during 6 years from 1955.5 to 1961.5. The results of x and y obtained by this method correspond to the coordinates on the fixed mean pole for the period of the data availed. Taking this into account, the present results are proved to be rather good agreement with the results of the International Latitude Service, and the fixed mean pole for this case is shown to be at x=+0″.062 and y=+0″.186 on the coordinate system of 1900-'05 of the I.L.S.
Corrections to be applied to the conventional longitude of each station for obtainning the consistent system are also given here as well as the station errors in periodic and irregular characters for each station.View full abstractDownload PDF (1126K) -
Sigetaka IIJIMA, Seiichi OKAZAKI1962 Volume 8 Issue 3-4 Pages 126-134
Published: March 31, 1963
Released on J-STAGE: July 05, 2011
JOURNAL FREE ACCESSVariations in the rate of rotation of the Earth are determined from the comparison of the mean UT1 against an atomic time scale for the period of 7 years from 1956 to 1962. The mean UT1 is that obtained from the weighted mean of the data of eleven observatories which have kept good time observations for the period from 1955.5 to 61.5, and for-the remainning period from 1961.5 to 62.9 only the data of the Tokyo UT1 is used instead Corrections for the longitude variation which are used to obtain the true UT1 are calcu-lated from the instantaneous pole's coordinates of the Earth determined by the same authors solely from the time observation data. While, the atomic time scale is principally based on cesium frequency standards at the N. P. L. (England) and the N. R. L. (U. S. A.).
As a result of this comparison correction for the seasonal variation in the rate of rotation of the Earth is separated as follows,
where t is the fractions of year. As for the residual variations the general aspect of the clock-face of the “Earth Clock” may be represented by five pieces of straight lines with different inclinations for the fractional periods, 1956.057.2 (-115 × 10-10), 1957.2-58.5 (-165 × 10-10), 1958.5-60.4 (-150 × 10-10), 1960.4-62.3 (-130 × 10-10) and 1962.3- (-155 × 10-10 ?). In these residual variations, moreover, the existence of a periodic term of some 5.5 years is plausible, although it is not yet definite.View full abstractDownload PDF (1001K) -
S. MIYAMURA1962 Volume 8 Issue 3-4 Pages 135-141
Published: March 31, 1963
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSDownload PDF (2877K)
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