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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Σελίδα viii
... case with most books on the subject of navi- gation , probably because feafaring people in general are very much indifferent as to the rationale of any rule given for for obfervation , provided it holds good in practice . viii . PREFACE ...
... case with most books on the subject of navi- gation , probably because feafaring people in general are very much indifferent as to the rationale of any rule given for for obfervation , provided it holds good in practice . viii . PREFACE ...
Σελίδα 53
... case of neceffity , diminish the number of his affistants , and might even be capable of making all the necef- fary obfervations himself , with a tolerable degree of accuracy , as follows : The Let two or three altitudes of the limbs of ...
... case of neceffity , diminish the number of his affistants , and might even be capable of making all the necef- fary obfervations himself , with a tolerable degree of accuracy , as follows : The Let two or three altitudes of the limbs of ...
Σελίδα 132
... case of the Sun , is the interval between noon and the given apparent time . But if the object is the Moon or a star , add the Sun's right afcen- fion to the apparent time ; the fum will be the right ascension of the meridian , the ...
... case of the Sun , is the interval between noon and the given apparent time . But if the object is the Moon or a star , add the Sun's right afcen- fion to the apparent time ; the fum will be the right ascension of the meridian , the ...
Σελίδα 233
... may no doubt give the latitude tolerably exact in some cases ; but in others , the mariner will be deceived above half a degree ; and in any cafe they are feldom free of error . H h REMARK . The dip of the horizon , in table ( 233 )
... may no doubt give the latitude tolerably exact in some cases ; but in others , the mariner will be deceived above half a degree ; and in any cafe they are feldom free of error . H h REMARK . The dip of the horizon , in table ( 233 )
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