Таємничий острів

           ThestarAlphaisabouttwenty-sevendegreesfromit,butCyrusHardingknewthisandmadeallowanceforitinhiscalculation.Hetookcarealsotoobservethemomentwhenitpassedthemeridianbelowthepole,whichwouldsimplifytheoperation.

           CyrusHardingpointedonelegofthecompassestothehorizon,theothertoAlpha,andthespacebetweenthetwolegsgavehimtheangulardistancewhichseparatedAlphafromthehorizon.Inordertofixtheangleobtained,hefastenedwiththornsthetwopiecesofwoodonathirdplacedtransversely,sothattheirseparationshouldbeproperlymaintained.

           Thatdone,therewasonlytheangletocalculatebybringingbacktheobservationtothelevelofthesea,takingintoconsiderationthedepressionofthehorizon,whichwouldnecessitatemeasuringtheheightofthecliff.ThevalueofthisanglewouldgivetheheightofAlpha,andconsequentlythatofthepoleabovethehorizon,thatistosay,thelatitudeoftheisland,sincethelatitudeofapointoftheglobeisalwaysequaltotheheightofthepoleabovethehorizonofthispoint.

           Thecalculationswereleftforthenextday,andatteno’clockeveryonewassleepingsoundly.

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