Our Collection

At the Institute’s core is the Gilder Lehrman Collection, one of the great archives in American history. More than 85,000 items cover five hundred years of American history, from Columbus’s 1493 letter describing the New World through the end of the twentieth century.

Barnes, Edward A., fl. 1857 Rule for ascertaining the longitude by Chro. at Sunset

Order a pdf of this item here.

Gilder Lehrman Collection #: GLC00722.07 Author/Creator: Barnes, Edward A., fl. 1857 Place Written: s.l. Type: Manuscript document signed Date: 1857 Pagination: 1 p. : docket ; 32 x 20 cm. Order a Copy

Details the procedure for obtaining longitude at sea based on the time of the sunset and latitude.

Barnes, Edward A., fl. 1857

Citation Guidelines for Online Resources