The Theory and Practice of Finding the Longitude at Sea Or Land: To which are Added, Various Methods of Determining the Latitude of a Place, and Variation of the Compass; with New Tables. By Andrew Mackay, ...J. Sewell, P. Elmsly, and J. Evans, 1793 |
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Αποτελέσματα 1 - 5 από τα 56.
Σελίδα 8
... height above the horizon every day . The figns in the fecond and third quarters of the ecliptic are called Defcending Signs . The TROPICS are circles parallel to the equator , whose distance therefrom is equal to the obliquity of the ...
... height above the horizon every day . The figns in the fecond and third quarters of the ecliptic are called Defcending Signs . The TROPICS are circles parallel to the equator , whose distance therefrom is equal to the obliquity of the ...
Σελίδα 30
... height . Let the quadrant be laid on a table , with its face upwards , and the index placed towards the middle of the limb ; then place the tools on the limb , one at each end , direct the fight to the index glafs , and let the position ...
... height . Let the quadrant be laid on a table , with its face upwards , and the index placed towards the middle of the limb ; then place the tools on the limb , one at each end , direct the fight to the index glafs , and let the position ...
Σελίδα 46
... height of these is nearly equal to that of the middle of the central mirror . ADJUSTMENTS OF THE CIRCULAR INSTRUMENT . The tendency of these adjustments is , to make the mirrors perpen- dicular to the plane of the inftrument , to make ...
... height of these is nearly equal to that of the middle of the central mirror . ADJUSTMENTS OF THE CIRCULAR INSTRUMENT . The tendency of these adjustments is , to make the mirrors perpen- dicular to the plane of the inftrument , to make ...
Σελίδα 53
... Height of the eye 18 feet . Times p . watch . | Dist . © and ) ' s nearest limbs | Alt . D's up . limb | Alt . O's low.limb 23h . 8 ' 31 " 71 ° 50 ′ 10 19 ° 5 ' 24 ° 56 ' II 18 52 20 19 26 25 I 13 15 53 O 19 45 25 5 15 I 53 50 20 24 25 ...
... Height of the eye 18 feet . Times p . watch . | Dist . © and ) ' s nearest limbs | Alt . D's up . limb | Alt . O's low.limb 23h . 8 ' 31 " 71 ° 50 ′ 10 19 ° 5 ' 24 ° 56 ' II 18 52 20 19 26 25 I 13 15 53 O 19 45 25 5 15 I 53 50 20 24 25 ...
Σελίδα 57
... height of the eye , the altitude of a ce- leftial object , as taken by the fore obfervation , is therefore greater , but lefs when the back obfervation is ufed , by a quantity equal to the angle contained between thefe horizons ...
... height of the eye , the altitude of a ce- leftial object , as taken by the fore obfervation , is therefore greater , but lefs when the back obfervation is ufed , by a quantity equal to the angle contained between thefe horizons ...
Άλλες εκδόσεις - Προβολή όλων
The Theory and Practice of Finding the Longitude at Sea Or Land: To Which ... Andrew MacKay Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2015 |
The Theory And Practice Of Finding The Longitude At Sea Or Land Andrew MacKay Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2018 |
Συχνά εμφανιζόμενοι όροι και φράσεις
Aberdeen add the log adjuſtment alfo alſo anfwering angle apparent altitude apparent diſtance arc fecond arc firft arch Arcturus arifing azimuth becauſe cafe co-fecant co-fine co-tangent Co-verfed computing correction correfponding courſe degrees Diff dift divifion Earth ecliptic emerfion equal altitudes equation error fame fecant feen femidiameter fextant fhip fhould figns fince finding the Longitude firſt Fixed Star folar ftar fubtract given glaſs greateſt Greenwich half Hence horizon glafs horizontal parallax increaſe inftrument interfection interval laſt latitude lefs limb logarithm mean meaſured meridian method Moon moſt motion muſt Nautical Almanac neareſt neceffary nonagefimal noon obferved altitude object Obliq paffing place of obfervation planet pofition purpoſe quadrant reduced Reduced latitude refraction Rifing ſhip ſtar Sun's right afcenfion tangent teleſcope thefe theſe tion tranfit true altitude true diſtance true longitude tude uſed variation Verfed Verfed fine watch weft zenith diſtance ΙΟ