. Tables of calculated hour-angles and altitude azimuth table 30N. to 30S. : ex-meridian tables 60N. to 60S. and calculated reductions ans azimuths of bright stars from 1 hour to 3 hours from Meridian / c by Blackburne . D. H. M. Green. 21 19 34 26Long. 51° E. +3 24 00 Time Sp. 21 22 58 + 1 26 34 23 00I 00 0000 .M. AT Ship. Obsd. Alt. © 5042 ft. Cor. 350 s. + 9*2 M. S. Eq. of Time i 289Cor. +5S Var. S. H. 1-25 X 4-4 5-50 True Alt. -©^ 50Redn. 2 44-2507 Cor. Eq. T. i 34*4 Men Alt. 53 34-9 S. Dist. 36 25-1 N. Dec]. 23 2yi S. Lat. 12 58-0 For Reduction
. Tables of calculated hour-angles and altitude azimuth table 30N. to 30S. : ex-meridian tables 60N. to 60S. and calculated reductions ans azimuths of bright stars from 1 hour to 3 hours from Meridian / c by Blackburne . D. H. M. Green. 21 19 34 26Long. 51° E. +3 24 00 Time Sp. 21 22 58 + 1 26 34 23 00I 00 0000 .M. AT Ship. Obsd. Alt. © 5042 ft. Cor. 350 s. + 9*2 M. S. Eq. of Time i 289Cor. +5S Var. S. H. 1-25 X 4-4 5-50 True Alt. -©^ 50Redn. 2 44-2507 Cor. Eq. T. i 34*4 Men Alt. 53 34-9 S. Dist. 36 25-1 N. Dec]. 23 2yi S. Lat. 12 58-0 For Reduction. Lat. (i) 13 ooo For the Azimuth (Table III.), ==^^ 2o N. Lat. 13° ( Table IV., 1 gives Lat. Var. ioi5, whichAz. 22 ( p. 259 ) gives (Table VIII.) N. Redn. at i m. = 2845 x 6om. = i7o7 =Redn. 2° 507 (p. 257) Lat. (decl.) 23^°, Azim. () i h. om. = (i5°), M = i6-85.(p. 256) Lat. (alt.) 5o|° and M. 16*85 gives Azim. S. 22° E. N. 68° E. 2ND Observation.— at Ship. H. M. s. Green. 21 36 22Long. 5o°3iV +3 22 6 Time Sp. o 58 28I 32 Obsd. Alt. 0 50 24-0 S. 42 ft. Cor. +92 True Alt. % 50 33 2 Redn. +2 507 I 00 00 Mer. Alt. 53 23-9 FigureLat (2) 13°3N. Dist. 36 36-1 Pos. s. S. H. Eq. of Time i 28*9 i25X24 Cor. 3-1 Slo Cor. Eq. T. i 32 o • Azim. 22° gives Redn. 2° ^o^^ -Q (Table IX.) ist Obsn. ©s Az. S. 22° E. gives lat. error 39 N. to E. at lat. 13 oo N. 2nd ,, ,, ,, 398. to E. ,. 13 9o N. Long. Lat. Error (sum) 78 : Diff. Lat. 9o :: i : ii-5 E. Long. Cor. ii5 x39 = Lat. Cor. 4.^. N. Lat. (i) 13 OOO 4-5 N. Lat. n 13 4-5 N. Long. (2) 50 31-5 11 5 E. Long, in 50 43*0 E. Note.—True Position by rigorous calculation (by spherics) 13° 4*9 N., long. 50° 44i E. Greater accuracy would have been obtained by calculating the Azimuth to the nearest minute of arc atboth observations by the rule of sines formula; the use of Table IV. is here given by way of example. EXAMPLES m THE USE OF THE TABLES X
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