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    Re: Celestial Navigation without a sextant.
    From: Andr�s Ruiz
    Date: 2008 Mar 12, 08:21 +0100

    Extreme refraction happens after a warm front. After a cold front the 
    temperature falls and the atmosphere become more stable. The worse conditions 
    were found at sea between the warm and cold front and under a fair whether 
    with great evaporation. Inland with great insolation rare effects for 
    refraction could appear
    See: http://www.geocities.com/navigationalalgorithms/Meteorologia/Frentes.pdf
    -----Mensaje original-----
    De: NavList@fer3.com [mailto:NavList@fer3.com] En nombre de Greg Rudzinski
    Enviado el: martes, 11 de marzo de 2008 23:39
    Para: NavList
    Asunto: [NavList 4649] Re: Celestial Navigation without a sextant.
    ... Extreme refraction can occure after the passage of a cold
    front. In this case opposing LOP's or a back sight will be needed to
    cancel out the refraction variable.
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