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0470	Report of a Mission to Yarkund in 1873 : vol.1

Report of a Mission to Yarkund in 1873 : vol.1 / Page 470 (Color Image)

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[Figure] l

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.)

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doi: 10.20676/00000196

Citation Format: Chicago | APA | Harvard | IEEE

OCR Text

( 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
	(43) + (44) + (45) = Log. sin q ...	T•8551	T•8588	T•8625-
	Log. tan q from (46)	0.0114	0.0190	0.0269
	Log. cos 31 (see (28) ) ... ...	T•9905	T•9904	T•9904
	Log..X (see (41) ) ... ...	0.3334	0.3334	' 0.3336
	Log. 15 ...	1.1761	1.1761	1•1761
	Log. sum r (47) + (48) + (49) + (50) ...	1.5114	1.5189	1•5270
	Log. ß	1.1650	1•1648	1.1646
	(52) — (51) = log. a (see Table IV.) ... +	T•6536	T•6459	T•6376
	1 + a	1.450	1.442	1.434
	I2—~_ l~Ll	18s. 26s.		32s.
	1-}-a
	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

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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 . . . . | 468 469 470 471 472 . . . . | . . . . 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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