A complete collection of tables for navigation and nautical astronomy. With simple, concise, and accurate methods, for all the calculations useful at sea; particularly for deducing the longitude from lunar distances, and the latitude from two altitudes of the sun and the interval of time between the observations / By Joseph de Mendoza Rios.

  • Mendoza y Riós, José de, 1763-1816.
Date:
1809
Catalogue details

Licence: Public Domain Mark

Credit: A complete collection of tables for navigation and nautical astronomy. With simple, concise, and accurate methods, for all the calculations useful at sea; particularly for deducing the longitude from lunar distances, and the latitude from two altitudes of the sun and the interval of time between the observations / By Joseph de Mendoza Rios. Source: Wellcome Collection.

    673/682 (page 55)
    Aux.Arg. 31'. 12 + 7 + 31 . 19 . App. alt. * - ~ App. alt. D 'Sum of app. alt. Compl. corr. *’s alt. Corre6t. ])’s alt. Prop, part Correded fum of alt. ,(^App. diflance Referved fee. Corredled diftance True diflance Diflances, September 19 at Greenwich App. time at Greenwich '{ at noon at 3'> 43 66 + + + 109 [ ss ] 13 34 (hor. parallax 61'. 13') 47 59 23 o 51 5 III. 9 • 56 45 • 3 57 45 ■ 0 , • 49 45 • 1 . . 46 45 • 34 • ■ 43 43 • 48 , • 45 o‘>. 55'. . 58^ N.I. 32993 116 N. II. - - 55248 iS 04574 11 2 N.m. - * N. IV. (fum) _93o6i Diff. 0°. 32'. 57 P. L«. Diff. I . 45 . 58 P. L. 73742 23010 2893 168 P. L. (diff.) 50732 And about 19’’. 15™ eftimated time the next morning, in latitude 20°. 25' S. the follow- ing altitudes of the Sun’s lower limb were obferved, for finding the error of the watch ufed before; the height of the obferver’s eye being 20 feet. Note, 28 mufi; be fub- tradled from the altitude for the error of the quadrant. Time by the watch. Altitude of O’s lower limb. 19'“. 25’. 10® 25 .34 25 -53 26 . 12 26 .34 26 . 50 16°. 8' . 30 14 . 0 17 .30 23 ...0 28 . 0 33 .30 156 . 13 123 .30 19 . 26 . 2 16 . 20 .35 28 - 4-24 4- 16 . 0 16 31 .43 3-2 16 . 28 .41 Time by w'atch when O’s alts, were obf. Time by watch when diflances were obf. Difference - Time at Greenwich when dift. were obf. Time at Greenwich when ©’s alts, were obf. By Nautical Almanac, for that time : O’s declination - - - - O’s femidiameter - - Sums. Means (dividing by 6). Error of the quadrant. Dip of the horizon. ' Semidiameter. App. altitude. Corredion of alt. True altitude. 19 O’s polar diftance - - Latitude - _ _ - O’s altitude _ _ . Sum _ _ - _ Half-fum Half-fum —alt. App. time before noon App. time at the fhip Time by the watch - - - Watch too fall _ _ _ Time by watch to mean dift. App. time at the fhip to mean dift. in the meridian of the obf. O’s alt. App. time at Greenwich Longitude of the fhip when the O’s altitudes were obf. he O’s I 91'. 5'- 56 20 . 25 . 0 16 . 28 . 41 127 . 59 • 37 63 • 59 • 49 47 • 31 • 8 4’'- 47'. 45* 24 19 . 12 . 11 19 . 26 . 2 13 • 51 13 • 3 • 52 12 . 50 . 1 0 . 55 • 58 11 . 54 • 3 = L. cofcc. L. fee. L. cofine L. fine L.verf 26 4 22 56 18 5 16 56 o N. 0.00008 0.02818 9.64191 9.86778 (fum) 9.53795 =2 178°. 31' Eaft. SCHOLIUM