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    Re: Sun altitude limits for natural horizon?
    From: Hewitt Schlereth
    Date: 2016 Feb 20, 16:09 -0800
    Ron, the ship was about one hour west of Greenwich. If the times for the sights are GMT, the ship's local times would be roughly an hour earlier.

    The 2016 almanac gives Civil  twilight at latitude 10* South on Jan 29 as 1852, so it might make sense that way.

    Hewitt


    On Feb 20, 2016, at 3:03 PM, Ron Jones <NoReply_RonJones@fer3.com> wrote:

    oops... I forgot to mention that the date was 29 January but the year was not given.

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