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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)

キャプション

[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

 

( 336 )

SPECIMEN COPY OF COMPUTATION OF ONE DAY'S

Computation of Longitude

~t Kashghar (Yangi-Shahr) Station, on

West of Meridian.

Moon Lower Limb observed.    Lat. N. = ¢ = 39 24 ,32 I Assu med

Ref.
No.

No. of observation (Mean of F. L. and F. R.)

1

2

3

  1.  

(43) + (44) + (45) = Log. sin q   ...

T•8551

T•8588

T•8625-

  1.  

Log. tan q from (46)

0.0114

0.0190

0.0269

  1.  

Log. cos 31 (see (28) )   ...   ...

T•9905

T•9904

T•9904

  1.  

Log..X (see (41) )   ...   ...

0.3334

0.3334

' 0.3336

  1.  

Log. 15   ...

1.1761

1.1761

1•1761

  1.  

Log. sum r (47) + (48) + (49) + (50)   ...

1.5114

1.5189

1•5270

  1.  

Log. ß

1.1650

1•1648

1.1646

  1.  

(52) — (51) = log. a (see Table IV.)   ...   +

T•6536

T•6459

T•6376

  1.  

1 + a

1.450

1.442

1.434

  1.  

I2~_ l~Ll

18s.   26s.

32s.

 

1-}-a

 

 

  1.  

L= Li + A Li   

5h. 4m. 42s.   4m.   34s.

4m.   288.

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 3 for each observation, i.e., for Nos. 1, 2, 3 ... 8. Do. A a

Do.   S for middle observation, and adopt this value as constant for all the other observations.
Do. L it

Do.   1 and AS for No. 1 and No. 8, and interpolate for Nos. 2 to 6 with change in Gr. Mean Time for
argument.

NOTE.-S and AS have the same sign and are both =L.— when upperlimb of Q is observed ; Aa is +

lower

in N. Latitude ; t is !if Q is we Meridian ; X is always + ; (3 is =I-- when Q is moving in Declination from

S. to N. sign of a = sign of /3 x sign of t. N. to B.

o   r   v