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The Ready Observator; or, an infallible Method for determining the Latitude at Sea, by Altitudes of the Sun, at any time of Day, ... independent of a meridional observation ... with a ... sett of Tables

N. D. FALCK

出版	London, 1778
URL	http://books.google.com.hk/books?id=yaBWAAAAcAAJ&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN