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Show [ 243] 166 I :f]ncampmcnt on tlte left bank of Platte rwcr, ten ?niles below Grauel island. DETERJ.\ITX.\.TIOK OF Til\IE. September 21, 1 42.-Altitucle of Arcturus. Obsf7'Vat ious . • FIRST SE RIES. S ECO~O ~ER IES . ' I Double altitude of Time of chronometer. Double altitude of Time of chronometer. Arcturus. I tlcg. 50 49 48 I Arcturu . min. sec. h. min. Sf'('. dt':f· WilL ,'CC'. h. min. 03 55 55 0~.5 47 0.) 2.3 9 03 15 30 8 57 16.7 . 46 ]() 55 I 9 05 01 50 9 00 34.0 I 45 36 50 9 07 I Result of calculation. l\1ean tim . Adl":lncc. Longitude. I deg. min. uc. 7 07 5l h. min. sec. I 1 53 29 .••••••••••••••••••••• September 21, 1 42.-Altitude of Polaris. Ob:wn;ations. Double altitude of PQ.o Time of chronometer. lari·. d~rr <>' min. sec. h. min. sc . b2 25 50 9 10 56 2 27 45 9 12 51 82 29 20 9 15 43 82 31 40 9 18 07 82 34 00 9 20 53 82 35 15 9 22 3() 82 37 45 9 24 15 82 37 40 9 25 47 82 40 00 9 28 13 82 41 00 9 30 09 'I'hermometer, 51°. Result of calculat1'on. True altitude. Mean time. Latitude. deg. min. SPC, 41 h. min. sec. deg. 15 ll 7 27 min. 51 41 05 sec. 3t3 sec. 03.7 15.0 01.0 • • 167 [ 243] JVoon halt at tiLe 1nouth of a small creek on the left bank of the Platte river .. ])ETERl\IIN1\TION OF LATIT l'DE. September 23, 184.2.-Altitndc of the Sun in the mcndinn. Observations. Double altitude of the True central altituuc. Latitude. Sun's lower limb. -------- - - ---- --- -------- deg. min. sec. 96 :n o5 deg. 111i11. se ~ . 4d 33 04 der. 111111. .~~c. 41 20 20 Index error - - 1' 32'' . Thermometer, 80°. Encampment on tho left bank of the P latLe river, n<;ar the Loup fork. DETERl\11NATION OF' L.\TITVDE. September 23, 184.:2.-Altitude of a Aq1..!ihn in the meridian . Observat-ions. . Double altitude of a True alti.t.ude. Latitude. Aquilre. cleg. min. sec . dr~ . min. sec. deg. min. sec. 114 1:2 10 57 0.4 43 41 22 52 Index error = - 1' 32". |
