File:Tablas Alfonsíes - Santritter (1492) - P223.png

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Captions

Captions

Alfonsí Tables - Semidiameter of the Sun, the Moon, the Umbra (shadow) and additional Penumbra

Summary

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Description
Español: Traducción desde las tablas del año 1492 (Tablas de Alfonso), obra de Johanni Lucilio Santritter. Agregüé unas columnas en el actual sistema decimal correspondiente al sistema sexagesimal ptolemaico.

NdT: en la primera tabla, "Semidiámetro del Sol", y en la última tabla, "Claridad en la Umbra (Penumbra)", las curvas que dibujan tales semidiámetros no hay continuidad (no son armónicas del tipo sinusoidales). Además de los valores máximos de los semidiámetros, en principio del lunar y del solar, que son mayores a los valores actuales:

Semidiámetros del Sol y de la Luna
Semidiámetro Mínimo Máximo
Semidiámetro de la Luna 14' 41" 16' 44"
Semidiámetro del Sol 15' 44" 16' 16"

Estas discrepancias entre las cantidades medidas en la edad media y las de la actualidad se deben, indudablemente, a la graduación en los instrumentos de aquella época juntamente con los instrumentos para medir el tiempo, en caso de observar el Sol y la Luna en su paso por el meridiano del lugar. O también por la medición de ambas luminarias sobre el horizonte teniendo en cuenta la refracción atmosférica que distorsiona el disco lunar y solar.
Date
Source Own work basado en los datos del Tabule astronomice Alfonsi Regis / (Augustinus Morauus Olomucensis Johanni Lucilio Santritter heilbronnensi). IBIS. Patrimonio Nacional - Real Biblioteca - España
Author
Fernando de Gorocica  (1962–) wikidata:Q104764450
 
Fernando de Gorocica
Description Argentine amateur astronomer
Date of birth 2 August 1962 Edit this at Wikidata
Location of birth Buenos Aires
Work location
Ciudad Jardín Lomas del Palomar; Villa Gesell Edit this at Wikidata
Authority file
creator QS:P170,Q104764450

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current17:07, 6 November 2023Thumbnail for version as of 17:07, 6 November 2023850 × 854 (250 KB)Fernando de Gorocica (talk | contribs)Uploaded own work with UploadWizard

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