Astrometría e Historia de la Astronomía

José Gómez Castaño 

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    Mi otro blog

    Blogalia

    Semidiámetro del Sol en el cálculo de eclipses

    Estoy realizando un trabajo en el que necesitaba conocer el semidiámetro solar para hacer la reducción de un eclipse de sol antiguo, y claro, como siempre, aparece la pregunta de cómo ha cambiado su valor a lo largo del tiempo. No porque el Sol haya cambiado fisicamente, me refiero a los valores adoptados a lo largo del tiempo como base para los cálculos. Así que he hecho una parada y he buscado algo sobre el tema para que no me queme la neurona que me queda con ese "run, run".

    Esta es la evolución del valor del semidiámetro solar a la unidad de distancia, es decir, la mitad del diámetro solar cuando se encuentra a 1 Unidad Astronómica de la Tierra.

    De 1767 a 1807 se adoptó el valor de 962.8", definido por Mayer en "Tabulae motuum solis et lunae novae et correctae; quibus accedit methodus longitudinum promota". Este valor se usó en las primeras predicciones aparecidas en el Nautical Almanac en este periodo. También en las tablas de los Eclipses de sol y de Luna para 1792 del primer Almanaque Náutico y Efemérides Astronómicas se usó este valor.

    De 1808 a 1833 se adoptó el valor de 961.37"

    De 1834 a 1852 el valor se cambió por el de 960.9", tomado de "Tabulae Regiomontanae", publicado por Bessel en 1830.

    De 1853 a 1895 se utiliza el valor de 961.82". Este valor proviene de las observaciones llevadas a cabo en el Observatorio de Greenwich durante 1853, y publicadas por Airy en "Obaservations made at the Royal Observatory, Greenwich, in the year 1853" (1855)

    De 1896 a 1959 se adopta el valor de 959.63", proporcionado por una recopilación de observaciones realizadas en Greenwich entre 1851 y 1853. en este mismo periodo de tiempo, comienza a utilizarse el valor de 961.18" para efemérides físicas del sol, y quedando el anterior para la predicción de eclipses unicamente.

    Me gustaría conocer referencias más antiguas de este valor, por lo que si alguien conoce de ellas soy todo oidos.

    2005-11-19 14:37 | Categoría: | 38 Comentarios | Enlace



    Referencias (TrackBacks)

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