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    Re: Rude star finder
    From: Gary LaPook
    Date: 2015 Dec 25, 00:25 -0800

    Every day twilight occurs 4 minutes earlier so the LHA Aries increases one whole degree so the maximum change in the altitude of a body bearing east or west is just one degree and only if you are at low latitudes. It is less for for higher latitudes and for other azimuths. If you want to get a more accurate change in altitude then use the "Motion Of the Body" table found in HO 249 that I previously posted.

    http://www.fer3.com/arc/img/102321.mob%204.pdf

    gl

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    Re: Rude star finder
    From: Gary LaPook
    Date: 2015 Dec 15, 23:53 -0800

    You should only need a star finder for the first evening twilight round of stars after leaving port. In fact, if the navigator isn't watching the evening news on TV at twilight the day before casting off but is out doing what he should be doing, looking up at the stars, then he shouldn't even need the star finder for the first night out. After that, the same stars will be visible every evening in approximately the same postions at evening twilight when moving at sailboat speeds. And, of course, no need for it at morning twilight since the navigator has all night to look up and identify the stars he will be shooting when the horizon comes up.

    gl

       
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