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0470 Report of a Mission to Yarkund in 1873 : vol.1
1873年ヤルカンド派遣報告 : vol.1
Report of a Mission to Yarkund in 1873 : vol.1 / 470 ページ(カラー画像)

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[Figure] l カシュガルでの緯度の一日の観測の計算結果の見本例. 月の天頂距離からの緯度の計算結果. カシュガル ( ヤンギシャール)駐屯地にて, 1873年12月28日 (civil date西洋暦?, 午後)-(続.)SPECIMEN COPY OF COMPUTATION OF ONE DAY'S OBSERVATIONS FOR LONGITUDE AT KASHGHAR. Computation of Longitude from Lunar Zenith Distances. At Kashghar ( Yangi-Shahr) Station, on 28th December 1873 ( Civil Date, P.M.) -(Continued.)

New!引用情報

doi: 10.20676/00000196
引用形式選択: Chicago | APA | Harvard | IEEE

OCR読み取り結果

SPECIMEN COPY OF COMPUTATION OF ONE DAY'S
Computation of Longitude
At Kashghar (Yangi-Shakr) Station, on

Moon { West of Meridian.
{ Lower Limb observed. Lat. N. = φ = 39 24 32 Assumed

Ref. | No. of observation (Mean of F. L. and F. R.) | 1 2 3
No. | |

(46) | (43) + (44) + (45) = Log. sin q ... | 1·8551 1·8588 1·8625
(47) | Log. tan q from (46) ... ... | 0·0114 0·0190 0·0269
(48) | Log. cos δ₁ (see (28)) ... ... | 1·9305 1·9904 1·9904
(49) | Log. λ (see (41)) ... ... | 0·3334 0·3334 0·3336
(50) | Log. 15 ... ... ... | 1·1761 1·1761 1·1761
(51) | Log. sum = (47) + (48) + (49) + (50) ... | 1·5114 1·5189 1·5270
(52) | Log. β ... ... ... | 1·1650 1·1648 1·1646
(53) | (52) − (51) = log. a (see Table IV.) + | 1·6536 1·6459 1·6376
(54) | 1 + a | 1·450 1·442 1·434

(55) | L₂ − L₁ = △ L₁ ... ... + | 18s. 26s. 32s.
| 1 + a
(56) | L = L₁ + △ L₁ ... ... − 5h. 4m. 42s. | 4m 34s. 4m. 28s.

Explanation of Symbols adopted.

Ast. D. stands for Astronomical Date.
Gr: do. Greenwich.
S. T. do. Sidereal Time.
N. A. do. Nautical Almanac.
Approx: do. Approximate.

Rules for Computation.

Compute δ for each observation, i.e., for Nos. 1, 2, 3 ... 8.
Do. △ δ }
Do. S } for middle observation, and adopt this value as constant for all the other observations.
Do. △τ }
Do. π and △S for No. 1 and No. 8, and interpolate for Nos. 2 to 6 with change in Gr. Mean Time for argument.

NOTE.—S and △S have the same sign and are both ± when upper limb of ℂ is observed; △δ is +
lower
in N. Latitude; t is ± if ℂ is W of Meridian; λ is always +; β is ± when ℂ is moving in Declination from
E
S. to N.
N. to S.: sign of a = sign of β × sign of t.