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.

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    Time at the (h*p, by the watch, to mean dift. Watch too fa ft before - - - App. time in the meridian of the obf. of O’s alt. Longitude when O’s alt. were obf. I'ime at Greenwich, the yth (to the near m.) 23!*, 55™. 2S‘ 35 23 • 54 . 50 11 . 20 . 0 11 . ■ 15 By Nautical Almanac, for that time : Q's femidiameter - - J) ’s horizontal femidiameter - . _ i) ’s horizontal parallax . . _ i6'. 18' l6 . 12 59 • 27 Aux.Arg. 14.2t + 7 _+ 4 14.32 App. alt. O App. alt. > Suna of app. alt Compl. corr. Q’s alt. Correft. 5’s alt. Prop, part Corredted fura of alt. + + + App. dlftance - - . Refcrved fee. Corredted difiance _ . _ True diftance _ - _ Difiances, Dec. 7, / at Q** - at Greenwich \at12 App. time at Greenwich (-|-9'’) App. time at the fliip, the in the) meridian of the obf. of O’s alt. J Longitude of the fliip then 59 • 12 26 ■ 35 (hor. parallax 59'. 27) 85 . 47 N. I. 47 59 50 31 52 24 87 . 37 . 47- 59 • 25 35l 58. ■ 43 . 3 58 . 43 . 38 57 . 30 . 45 59 • 9 • 13 ii\ 13™. 14= 23 . 54 • 50 ] I . , 18 . 24 N. II: N. Ill, N. IV. (fum) DifF. Diff. 12.53 38 . 28 P. L. - P. L. 39264 P. L7 26198 (diff.) 13066 2^169°. 36'Weft. 26991 21 58726 63' 94S02 137 80740 ll I EXAMPLE II. September ig, 1793, about 30” eftlmated time, longitude by account 178°. 30'E. tbe following altitudes and diftances of a Arietis and the Moon were obferved to determine the true longitude of the ftiip ; the height of the obferver’s eye being 20 feet. Note, 2. g' muft be added to the diftance, i^ 1%' fubtradted from the Moon’s altitude, and 30 from the ftar’s altitude, for the errors of the quadrants. Eflimated time at tbe (hip - 12'“. 50™ Longitude - - - 11 . 54^» Eftimated time at Greenwich - o . 5.6 By Nautical Almanac, for that tirne : I) ’s hor. femidiameter - - 16', 41 D’s hor, parallax - - 61 . 13. Sums. Means (dividing by 6). Errors of the quadrants. Dip of the horizon. Semidiameter. Apparent altitudes and diftance. Time by the watch. Altitude of * Altitude of j) 's U.Limb. Dift. of ]) s remote limb from * 13''. I” .50' 43° 0' •30 67° . 28' . o' 45 ’.19' -.45 2 25 7 . 0 67 . II • 0 19 . IS 3 . 21 14 . 0 66 •59 . 0 18 •45 4 . 14 20 •50 66 .51 . 0 18 •30 5 . 11 29 . 0 66 • 36 , 0 18 • 15 6 . 8 38 . 0 66 •32 . 0 - 18 . 0 23 • 9 109 . 0 401 • 37 . 0 112 •30 13 • 3 •52 43 18 . 10 66 •56 10 45 . 18 •45 — 30 — I 12 + 2 • 9 — 4 24 — 4 24 - - - — 16 •57 — 16 •57 43 13 16 66 ■33 •37 45 • 3 •57