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    Re: Day's lenght
    From: Zorbec Legras
    Date: 2002 Dec 22, 14:06 -0500

    ----- Original Message -----
    From: Pierre Boucher 
    Date:         Sun, 22 Dec 2002 13:34:13 -0500
    To: NAVIGATION-L{at}LISTSERV.WEBKAHUNA.COM
    Subject:      Day's lenght
    
    Cher ami,
    Je ne parviens pas � poster sur la liste bien que j'y sois depuis longtemps.
    De votre adresse je d�duis que vous �tes francophone.
    Voici la formule qui calcule l'arc semi-diurne.
    Cette formule s'applique � tous les astres et donne la demi dur�e de visibilit�.
    ASD = arcCos (-Tan L *  Tan  d)
    La dur�e de visibilit� est de 2 x l' ASD.
    
    ASD : arc semi-diurne
    L  : latitude du lieu
    d: d�clinaison de l'astre
    
    
    La formule est mise sous forme de table dans les "Tables de logarithmes et de navigation"
    de G. Friocourt, Table XXIV dans mon �dition.
    J'esp�re avoir pu vous aider, bonne semaine.
    
    Cpt. Zorbec Legras
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