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    Re: STARS below ?? declination are never visible.
    From: Brad Morris
    Date: 2017 Jan 26, 11:09 -0500

    Although the 2102D is heresy to one noted individual on NavList (yes Frank, that's you), it will quickly produce a list of the stars among the 57 navigational stars that you might see.  You can then check those stars against the extinction rules of thumb which many have indicated.

    Using the 55° N template, the following Navigational stars all have S declination. The degrees above horizon are the maximum, dependent on time of year.

    Diphda, 17° above horizon
    Rigel, 27° ah
    Sirius, 18° ah
    Adhara, 6° ah
    Alphard, 26° ah
    Geniah, 18°ah
    Spica, 24° ah
    Zubenelgenubi, 20° ah
    Antares, 9° ah
    Sabik, 20° ah
    Shaula, below horizon
    Kaus Australis , 1° ah
    Nunki, 9° ah
    Formalhaut, 6° ah

    I then switched to the less common Cp300/U, so as to set this star finder to 52°N.  These are the maximum altitudes, dependent on time of year

    Diphda, 20° above horizon
    Rigel, 30° ah
    Sirius, 21° ah
    Adhara, 9° ah
    Alphard, 29° ah
    Geniah, xxxxxxx not on CP300/U
    Spica, 27° ah
    Zubenelgenubi, xxxxxx not on CP300/U
    Antares, 12° ah
    Sabik, 23° ah
    Shaula, 1° ah
    Kaus Australis , 4° ah
    Nunki, 12° ah
    Formalhaut, 9° ah

    It took far longer to type this than to observe the maximum altitudes during the year.  Of course, using computer driven models will produce a more accurate result, although, I would wager, at far greater expense in time.  Both star finders and any computer model will put the star into your FOV when presetting the sextant to the angle provided.

    You can now have the joy of verification of the extinction rules of thumb. Hope to hear back on your results in a year!!


    On Jan 25, 2017 4:24 AM, "Herman Dekker" <NoReply_Dekker@fer3.com> wrote:

    Just a simple question, on internet I did not find the answer.
    I live on 52° North at sealevel. I can never see Stars (above the horizon)  that have a S declination more then ?? °


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