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Almanach Perpetuum, 1496, Salamanca, facsimile of 1914
Abraham Zacuto, Salamanca
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NavigArte
Once south of the equator, the Pole Star can no longer be used to determine latitude. Only after the annual declination of the Sun became known, and after Zacuto of Salamanca published these declination tables in 1473 (following Toledo), was it possible to use the Sun to determine latitude at sea and to navigate further south beyond the equator.
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Facsimile of the important work of Abraham Ben Samuel Zacuto, a Hebrue astronome born in Salamanca. He published the first declination tables, similar to the Toledo tables, important to navigate using the sun. This was important when the Portugues navigators sailed beyond the equator where they couldn't use the Polestar anymore.
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