Astrometría e Historia de la Astronomía

José Gómez Castaño 

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Documentos:

  • Trabajos sobre Astrometría
  • Trabajos sobre Historia
  • Mis libros preferidos
  • Ocultaciones Estelares

  • Astronomía

    Astrometría de Cometas
    Cuadernos de Bitácora Estelar
    El Beso de la Luna
    El Muro de Planck
    El ojo en el cielo
    Cuaderno de Observación
    Historias de la Ciencia
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    Cartografía Lunar
    Tránsitos de Venus
    Historia LIADA
    Comunidad Virtual Cielo Oscuro
    Cielo Oscuro

    Cartografía

    Blog de la IDEE
    Blog Descartes
    SIGdeletras



    Mi otro blog

    Blogalia

    Figura de la Luna Aparente y Libración Topocéntrica

    Los movimientos de Libración en Latitud y Longitud de la Luna, permiten en cada momento tener un aspecto diferente de la misma. Aunque existe diverso software que permite calcular estos parámetros, como se suele decir, más vale una imagen que mil palabras. En el USNO, se dispone de una herramienta que actualiza la imagen aparente de la luna, mostrando además los valores subsolar y surterrestre.




    Con la imagen tenemos la apariencia real del disco lunar visto desde la Tierra a la hora que aparece en Tiempo Universal. El norte celeste está hacia arriba y el Este hacia la izquierda.


    La imagen muetra los valores de la libración geocéntrica, eso es, vista desde el centro de la tierra, pero para obtener los valores de la libración topocéntrica, la observada desde un lugar cualquiera de la Tierra, hay que introducir una variaciones. Como no he encontrado una explicación de cómo llevar a cabo los cálculos, detallo cómo hacerlos con un sencillo algoritmo. Siendo


    H el ángulo horario de la Luna, calculado a partir de la hora siderea local y la ascensión recta de la luna.

    P el Angulo de Posición del Norte

    la latitud del observador

    la declinación geocéntrica de la Luna

    la paralaje geocéntrica la de la Luna


    Calculamos unos parámtetros auxiliares









    y obtenemos los valores de la diferencia en libración en longitud y latitud




    2010-08-05 18:41 | Categoría: | 37 Comentarios | Enlace



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