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0471	Report of a Mission to Yarkund in 1873 : vol.1

Report of a Mission to Yarkund in 1873 : vol.1 / Page 471 (Color Image)

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[Figure] r

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.)

Citation Information

doi: 10.20676/00000196

Citation Format: Chicago | APA | Harvard | IEEE

OCR Text

( 337 )

OBSERVATIONS FOR LONGITUDE AT KASHGHAR.-(Continued.)

from Lunar Zenith Distances.

28th December 1873 (Civil Date, P.M. )

° //

6 15 Barometer = B = 25.6 Inches.

5k. 5m. in time Thermometer = T = 18° (Fahrenheit.)

4	5	6	7 8		9	10
P8670	T•8691	T•8725	T•8743	1.8768	T•8786	T•8812
00366	00412	0 0488	0.0528	0.0586	0.0627	0.0689
T.9904	T•9903	1•9903	T•9903	1.9903	' T•9902	T'9902
0.3336	0•3336	0.3336	0.3336	0.3339	0.3339	0.3339
11761	1•1761	11761	1•1761	1.1761	1•1761	1.1761
15367	1•5412	15488	1•5528	1•5589	1.5629	15691
1.1644	1•1643	1.1641	1•1640	1•1638	1•1637	1.1635
T 6277	T•6231	T•6153	1•6112	1.6049	T•6008	P5944
1424	l'420	1412	1.409	1.403	1399	1•393
19s.	208.	24s.	188.	248.	37s	26s.
4m. 41s.	4m. 40s.	4m. 36s.	4m. 42s.	4m. 36s.	4m. 23s.	4m. 34s.

Mean resulting longitude from observations on 28th December 1873-5k. 4m. 36s. or 76° 9' 0".
Table used to facilitate the computation.

Long. E. = Ll = - 76

i

TABLE I for A S				TABLE II for A it
1 X m a.•-- .- Mai~	Horizontal semi- diameter.			a; z ..3 cd	Equatorial Parallax. 53'	61'
1 X m a.•-- .- Mai~	14' 0"	17' 0"		a; z ..3 cd	Equatorial Parallax. 53'	61'
o	//	/		o	If	I/
0	12.7	18.8		0	0.0	0.0
10	125	]8 6		10	0.3	0.4
20	12.0	17.7		20	1•2	14
30	11.0	16.3		30	2.7	3.1
40	97	14'4		40	4.4	51
50	82	12.1		50	6.2	7.2
60	6.4	9'5		60	8.0	9.2
70	4.4	6.5		70	9.4 ,	10.8
80	2.3	3.4		80	103	11.9
90	0.1	0.2		90	10.6	122

TABLE III for A =D (1-f)

0

5

10

15

20

25 80 35 40 45 50

53'

61'

//

0.0

1.8

3.7

5.5

7.2

8.9 10.6 12.1 13.6 149 16.2

If

0.0

2.1

4.2

6.3

8.3 10.3 12.1 13.9 15.6 172 18.6

D •

Example. =300•5'

r =56'•7, = 7°
From Tables

D= 1l."•5
-fD= - 1.2

0

5 10 15 20 25 30

f

00 '00
02
03
06
09 1.3

A =10

rif

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1 . . . . | . . . . 12 . . . . | . . . . 22 . . . . | . . . . 34 . . . . | . . . . 45 . . . . | . . . . 57 . . . . | . . . . 69 . . . . | . . . . 80 . . . . | . . . . 92 . . . . | . . . . 103 . . . . | . . . . 114 . . . . | . . . . 126 . . . . | . . . . 137 . . . . | . . . . 148 . . . . | . . . . 159 . . . . | . . . . 169 . . . . | . . . . 179 . . . . | . . . . 191 . . . . | . . . . 203 . . . . | . . . . 214 . . . . | . . . . 225 . . . . | . . . . 237 . . . . | . . . . 248 . . . . | . . . . 258 . . . . | . . . . 270 . . . . | . . . . 281 . . . . | . . . . 293 . . . . | . . . . 304 . . . . | . . . . 316 . . . . | . . . . 327 . . . . | . . . . 337 . . . . | . . . . 350 . . . . | . . . . 363 . . . . | . . . . 374 . . . . | . . . . 385 . . . . | . . . . 396 . . . . | . . . . 407 . . . . | . . . . 419 . . . . | . . . . 432 . . . . | . . . . 442 . . . . | . . . . 452 . . . . | . . . . 462 . . . . | . 469 470 471 472 473 . . . | . . . . 482 . . . . | . . . . 492 . . . . | . . . . 502 . . . . | . . . . 512 . . . . | . . . . 522 . . . . | . . . . 532 . . . . | . . . . 542 . . . . | . . . . 552 . . . . | . . . . 562 . . . . | . . . . 572 . . . . | . . . . 582 . . . . | . . . . 592 . . . . | . . . . 602 . . . . | . . . . 612 . . . . | . . . . 622 . . . . | . . . . 632 . . . . | . . . . 642 . . . . | . . . . 652 . . . . | . . . . 662 . . . . | . . . . 672 . . . . | . . . . 682 . . . . | . . . . 692 . . . . | . . . . 702 . . . . | . . . . 712 . 714

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