(Vol. VIII. Part II.—p. 504.) 
‘Times, =) 8*1'524.8 2 R8".2 3/3'.8 53 39.3 4 18.4 4 48.3 5 24.3 5 59.3 6 36.3 tf 11.8 q 46.8 
Altitudes observed, 38° 195 88° 20) 88° 80’ 38° 40 88° 50’ 39° 00' 39° 10’ 89° 20 39° 30 39° 40 39 ne Suecein farcnntink ea 
un’s declin. at noon lod 
$*46' 48" before noon, + 3.41 — 8354 
oe of Refraction — Parallax — 2/37".4 Also — 2 29.7 a fd Fae ane F 
Semi-diameter, +15 59-5 15 59.5 un’s . corrects 44 30 0 44 36.6 
Correction for Refr. Parallax, 13 22 & semi-diameter. ee re Ms 4 ss + 18 29.8 Semi-diam. Paral. & Refrac. Cosine, - ; 9999636 i 635 
ibe 3 298 re coe 1981520 01951520 
; eee sees Ae 221 + 99, . co, cos, Lat. 1.195152 . 52 
True Altitude, - 19 15 22 20 05 29.8 True Alt. Sun’s Centre. eo 
. 0.1951884 0,1951885 
Co.-Latitude, - 39° 38/45” 89° 38 45” 
Sun’s declination South, 0 44 30 0 44 35.6 
Sun’s Meridian Altitude, 38 54 15 38 54 09.4 
Nat. Sine, - - 627963 627963 
Proportional parts for /’ + 59 Diff, proportional parts, = 23 36 
628022 62799 
$ 
H 
H 
Co-Latitude, a 39° 38° 45! FER REREETAREREHAHSERESES FRESHEST U ERE EES R eR HEE EEE EEREEE HEE BEBESESE EEE HEHEHE SESE EES EDERESSMENESSOREEY ? seneeegeee Petre ee eeeee Dense etna een eae shemerawennee Seen eee ee eeeeee 
¥ in. S. - 7 t wot Me 
Sun's 0 4430 The 23 Proportional Parts for difference of Sun’s declination to be equally distributed from first to last Observation. 
Fans Meridian Altitude, 38 54 15 
at. Sine, 5 = 628022... 628020 628017 628015 62 3 
pay ts 0 28013 628010 628008 628006 628004 
N, sine Ist Alt..19°16/ 22 629691 331068 332436 333807 335178 336548 337917 539285 340653 ee ite 
Difference - - 298331 296957 295581 % j 1 
= ’ Aa b 94208 292835 291462 290091 288721 
Prop. parts for  N. sines, 100 103 107 il 114 118 121 125 kis er 7 ae 
Log. : 298231 296854 Q95474 294097 2 a 
: ets 296 295 29409 92721 291344 289970 288596 28722: 
ASR ei a eubas parahae 9,4705194 9.4684906 9.4664539 9.4644662 9.4623531 9.4602903 SASERI0S 9. 4561852 9. ree 
. dat. 0.192 1951884 0.1951884 0.1951884 0.1951884 0,1951844 0.1951885 0.1951885 0.1951885 0.1951885 0.1951885 
9.6697412 9.6677314 ——— —— : 
iva ui 9.6657098 9.6636790 9.6616423 9.6595946 9.6575416 9.6554788 9.6534078 9.6513237 9.6492342 
—- 9839 
572)4288(7'.4 a503( 
4004 590)2508(4.2 
2360 
234 Lee 
143 
Time from Noon, - 3 51 17.4 3 50 42.3 3 50 0 ¢ 
Times of Observation, 8 8 426 TL 3 49 31.9 3 48 56.7 $ 48 21.3 8 47 46.10 8 47 10, ‘ 
cktanceaeter "Tinea, niniiscts 8 oe a : 9 52.9 8 10 98.1 811 33 8 11 38.7 8 12 140 8 iz ra 3 ie Pe 3 4 ong 3 is aes 
SAE 2 S§ 8 38 8 3 398 8 413.4 8 04 48.3 8 5 243 8 5 593 8 6 363 8 7118 8 7 463 
Chronometer — App. Time, 6 49.8 6 49.5 6 49.6 6 43.8 6499 e504 Py = —— a 
7a i 6 49.7 6 50.1 6 48.5 6 48.9 6 49.5 
49.6 u 
48.8 
ans Result of Equal Altitudes observed the same Day with Sextant. Sun’s Longitude 6s 2° 0’ 
50.4 10» 42’ 057.3 28°3 11’3 BY 35".3, 120°.3 4.3 
49.7 1 2554 108 a8. i d ) ‘ rae ys tei Middle Observati 3 
50.1 iiss = pes, ee ge 20,0" 33.3 50.6 "73 ete le Observations, 
48.9 11 45 40.7 39.1 39.8 41.6 39.6 40.3 37.6 "89.0 589. 38.6 
49.5 == 49.5 49.9 50.8 47.8 gon a) Bao i 
ee 11 52 50.3 : et oe a2) 494 49.8 eat 
10)6 496.2 49.5 ll 52 49.77 d , 
— 49.9 + 18.03 Equation of Equal Altitudes. 
Men, - - - = 6 4962 50.8 zeadies 
Rate to Noon, =~ 61 49.8 11 53 07.80 Mean of Apparent Noon, by Equal Altitudes. 
Difference of Meridians, — .06 DO EM hes tenatehecares 11 53 07.80 —_—_——. Simple Ragin with Sextant. 
Reduction of Equation to Noon, + 3.25 48.8 H 
a 49.5 
0 6 52.20 49.4 i 
11 53 07.80 by Chronometer. 49.8 $ 
App. Noon, rs 
CALCULATION FOR THE TIME WITH AND WITHOUT EQUAL ALTITUDES. 
Valenciennes. % 25th September 1817. 
Valenciennes, 25th September. Very clear. 
Mode of determining the Time by a Sextant of TnrovcHton’s, No. 1200. 
Latitude 50° 21/15” Longitude East of Paris 4’ 44!” in time. 
11 52 49.77 Mean.....-+ 
App. Noon 1]» 51’ 41".7 
