Peter Delamar: Tables for computing the effect of refraction on Lunar Distances
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Cartographer:
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Peter Delamar
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Title:
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Tables for computing the effect of refraction on Lunar Distances
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Date:
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1802
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Published:
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Philadelphia
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Width:
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21 inches / 54 cm
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Height:
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15 inches / 39 cm
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Map ref:
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CELEST645
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Description:
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| 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] |