眼視天頂儀と浮遊天頂儀による緯度観測の完全比較

DOI Web Site

書誌事項

タイトル別名
  • On the Complete Comparison of Latitude Observations with the Visual and Floating Zenith Telescopes
  • ガンシ テンチョウギ ト フユウ テンチョウギ ニ ヨル イド カンソク ノ カンゼン ヒカク

この論文をさがす

説明

Latitude observations with the visual zenith telescope (VZT) and the floating photo-graphic zenith telescope (FZT) were made according to the same ILS star system during the period from 1964 to 1966 at Mizusawa. In this note the comparison of observations with both instruments is fully discussed. <BR> The difference between monthly mean latitudes with the FZT and those with the VZT show the fairly conspicuous semi-annul variation which gives two maxima in May and November. This semi-annual variation may be attributed to the diurnal variation of atmospheric temperature. <BR> The diurnal variations of latitude, free from the effect of an error in the aberration constant, have been deduced from closing errors for both instruments as follows. <BR> 0″.030sin(θ-α+16h)for the VZT, <BR> 0″.008sin (θ-α+24h) for the FZT, <BR>where 0 denotes the mean longitude of the sun and a is the mean right ascension of a group. The amplitude for the FZT, 0".008, may be explained by the effect of the room refraction. and the phase for the FZT (24h) is near to that for various visual instruments at Pulkovo (22h). Consequently, the diurnal variation for the FZT seems to be more stable to the effect of the accumulated accidental errors between consecutive group mean latitudes than that for the VZT. <BR> The errors of observations are estimated by two ways: the one is derived from resi-dual latitudes of individual pair from daily mean latitude (internal error) and the other form discrepancies of daily mean latitudes from normal latitude which is interpolated from the effect of polar motion (external error). The internal errors for the FZT are relatively smaller than those for the VZT, but the external errors for the former are of nearly same order as those for the latter. <BR> We may conclude that latitude observations with the FZT can give the nearly same contribution to the determination of the polar coordinates in the ILS as the VZT.

収録刊行物

  • 測地学会誌

    測地学会誌 12 (3-4), 140-150, 1967

    日本測地学会

詳細情報 詳細情報について

問題の指摘

ページトップへ