Astrometría e Historia de la Astronomía

José Gómez Castaño 

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    Mi otro blog

    Blogalia

    Sincronizar el PC con un reloj atómico usando protocolo NTP

    Son muchas las ocasiones en las que necesitamos tener una fuente de tiempo fiable que permita sincronizar el reloj de nuestro PC. Para llevar a cabo observaciones astrométricas de calidad, en la observación de ocultaciones estelares, eclipses, etc... es obligatorio disponer de un reloj interno sincronizado de forma que tengamos la hora UTC con la mayor precisión, para que los resultados de la reducción de las observaciones, sean útiles.

    La forma más eficaz de hacerlo es utilizar el protocolo NTP, que permite recibir señales de tiempo provenientes de una gran cantidad de relojes de atómicos repartidos por todo el planeta. Hay una gran cantidad de software disponible para hacerlo, para varios sistemas operativos. En el vídeo adjunto se muestra cómo sincronizar nuestra máquina Linux con cualquier servicio de tiempos NTP.El vídeo dura 8 minutos, aunque aparece como más tiempo.



    Sincronizar Ubuntu linux con un Reloj Atómico mediante NTP from Jose Gomez Castaño on Vimeo.



    En este sistema operativo disponemos del comando NTPDATE, que permite sincronizar y obtener el retraso de nuestro sistema. Además permite que en cada arranque, se produzca la sincronización de nuestro reloj interno con el servidor NTP que queramos. Una lista de los servidores NTP se puede encontrar en http://support.ntp.org/bin/view/Servers/WebHome

    En España disponemos hace tiempo de la dirección hora.roa.es, desde la que se distribuye la señal de hora oficial UTC desde el laboratorio de hora del Real Observatorio de la Armada de San Fernando. Durante años, las señales se distribuyeron por radio en las frecuencias de 15.006 y 4.998 Khz, entre las 10:00 y 11:00 de cada días en escala UTC.

    2010-07-04 20:38 | Categoría: | 101 Comentarios | Enlace



    Referencias (TrackBacks)

    URL de trackback de esta historia http://meridies.blogalia.com//trackbacks/67273

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    una consulta ¿siguen en servicio las señales horarias por radio ? Es que estoy leyendo un libro "clásico" (de 1948) del padre Aller, reeditado por la USC, "astronomía visual" y plantea el uso de esas señales para varias actividades.
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    Pues la transmisión de señales horarias en HF están temporalmente fuera de servicio, según la web del ROA. Estas emisiones se pueden recibir durante dos periodos de 25 minutos diarios, en 15006 y 4998 KHz. Respectivamente, entre 10:00 y 11:00 horas UTC.

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