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Peter Delamar: Tables for computing the effect of refraction on Lunar Distances

Map: CELEST645
 
Cartographer: Peter Delamar
Title: Tables for computing the effect of refraction on Lunar Distances
Date: 1802
Published: Philadelphia
Width: 21 inches / 54 cm
Height: 15 inches / 39 cm
Map ref: CELEST645
Description:
Extremely rare engraved broadsheet navigational aid for computing Lunar Distances, engraved by Francis Shallus. This was an early method proposed for calculating longitude at sea before the invention of Harrison's chronometer. [CELEST645]