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雞之家APP系統原生開發

发布时间:2019-12-16点击数: 136 作者:立博体育网站

Forthefirsttime,ShenKuofoundthatalthoughthemagneticneedlewasfacingsouth,itdidnotrefertothesouth,butslightlytotheEast.

Thisisthephenomenonofmagneticdeclination,whichiscausedbythefactthattheearth'smagneticpolesdonotcoincidewiththegeographicalNorthandsouthpoles,withsomedeviation.Thisdiscoverywasagreateventatthattime.

Inthewest,itwasnotuntilColumbuscrossedtheAtlanticOceanin1492thatmagneticdeclinationwasfound,morethan400yearslaterthanShenkuoinChina.

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