TO YELLOWSTONE NATIONAL PARK. 
Determination of latitude by circum-meridian altitudes. 
89 
Station, Carroll, Montana.—Date, September 20, 1875.—Object: observed, @-—Sextant, Spencer Browning, 6536.—Index error, —1/ 15/.—€hro- 
nometer, Arnold & Dent, 1362,—Observer, Wood.—Computer, Wood.—Bar., 27in, 61.—Ther., 619. 
3 % Obs’d 2 cir-| Obs’d alti- , 
Times it Mer. dist. sin a2 cos cos D |Red, tomer.| cum-meri-| tudes, cor-| True alti- Bae eh : Lat. deduced 
chron VY) =p. sin l” |——Sosq | in are=z2. dian alti-| rected for] tudes=a. z-A. |= 90°+D—A. 
=k tudes. index error. 5 oat 
h. Mm 8 U7 “ a“ “uw fo} t a“ fe) t a“ fo} ri a“ °o t “u fe} t we 
12 50 43. 4 42. 43 40 86 24 50 43 11 47 43 26 56 43 27 36 47 34 51 
51 12. 4 13. 35 33 87 29 00 43 52 27 05 27 38 49 
51 42.5 3 42.5 QT 25 86 25 30 12 07 27 16 a7 41 46 
52 18.5 3 06.5 19 “ 18 87 29 50 4417 27 30 27 48 39 
52 47, 2 38. 14 a 13 86 25 50 12 17 27 26 27 39 48 
5314.5 210.5 9 Ay 9 87 30 00 44 22 27 35 27 44 43 
53 39. 1 46. 6 3 6 86 25 40 12 12 27 21 Q7 27 60 
54 15. 1 10. 3 & 3 87 30 10 44 27 27 40 27 43 44 
54 53.5 31.5 0 3 0 86 26 00 12 22 27° 31 27° 31 56 
55 27. 02. 0, 3 0 87 30 00 44 22 27 35 27 35 52 
55. 50. 25. 0 q 0 86 25 50 12 17 27 26 27 26 61 
56 19.5 54.5 2 | 2 87 29 50 44 17 27 30 27 32 55 
56 46. 1 21. 4 8 4 86 25 40 12 12 27 QL 27 25 62 
57 24.5 2 00. 8 q 8 87 29 50 44 17 27 30 27 «38 49 
57 57.5 2 32.5 13 i) 12 86 25 30 12 07 27 «16 27 28 59 
58 25.5 3 00.5 18 o 17 87 29 30 44 07 27 W 27 37 50 
58 46.5 3 21.5 22 21 86 25 20 12 02 27 11 27 32 55 
59 20. 3 55. 30 28 87 29 20 44 02 27 15 Q7 43 44 
12 59 49 4 24, 38 | J 35 86 25 00 43 11 52 43 27 OL 43° 27 36 47 34 51 
Mean latitud 0: sc iaane oe see neccecn es Seeecame trite siwsmienebecectad ia ececeameeeen bishescins veneGealeawes aaeeReeeela 47 34 51 
hm 8. son sou 
App. Lat. =1 cos 9. 82899 Chron. correction —1 02 04.16 Semi-diam. +15 58, —15 585 
ec. cos 9, 99993 Equation of time + 6 38.92 Refraction — 55.9 — 54.9 
@ cos 0, 13922 —— Parallax + 63 0 + 6.3 
—_ — 55 25.24 ——_  —-§ 
9, 96814 +15 09. —16 47. 
Determination of the time by observed equal altitudes of the sun’s limb. 
TO CORRECT THE CHRONOMETER AT NOON. 
Station, Carroll, Montana.—Date, September 20, 1875.—Sextant, Spencer Browning, 6536.—Chronometer, Arnold & Dent, 1362.—Observer, 
Wood.—Computer, Wood. 
; i Chron. fast of 
Corresponding times. : 
Observed t-—t/= |Equationof mene 
double alti- elapsed | eqnal alti-| PRY Toer oy 
tude. / time. tudes=2. | oon alee Iti. 
A.M.= P.M.=? tudes. 
fa hem 8. hom. 8. h, m. 8. hom 
72 10 00 10° 51 40.5 2 58 34.5 
52 04.5 5k 10.5 
52 29. 57 47. 
52 51.5 57 23. 
53° 14.5 57 00. 
53 38. 56 37. 
re 54 03. 56 14.5 4 2 +16.80} 1 02 04.16 
54° 27. 55 (50. 
54 50.5 55 27.5 
55 14.5 55 (04, 
55 38.5 54° 42. 
56 02. 54 16.5 
73 10 00 10 56 26.5 2 53 53 =|) 
id 34° 03.08 
T= 412m log A (page 164) = — 9. 4263 log B = + 9. 3627 . 
6 =—58". 33 ine 6 si =— 1.7659 log 6 = — 1. 7659 14 56 13.81 
L= 47° 35/ log tan = 0.0392 log tan D = +4 8.2597 —_—_—_ 
lst term = +17. oh tun aa 25 50 16,89 
=— 08 = . =-9 —_ —_—— 
ee ee 12 55 08.44 
« = +16*,8 = equation of equal altitudes. 16. 80 
12 55 25,24—eq. of time. 
11 53 21.08 
1 02 04,16 
