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    Re: Art and Navigation
    From: Carly Butler
    Date: 2015 Apr 27, 07:33 -0600

    Date was the solstice: December 21st.  And I was on the beach, not on a
    boat - sorry, forgot to mention both important pieces of information.  I
    knew I should have an artificial horizon, but I actually thought  it
    wasn't that important (!) and that I could get an approximate location
    that wouldn't be so far off.
    (I'm actually reading the thread about creating my own artificial
    horizon with a mirror in a bucket with great interest - that probably
    would have helped me a lot.  At the time I thought 'oh well, I don't
    have any mercury but it will be fine…)
    Will have to look up what time it was exactly…something close to noon,
    Sisal time, but I will check…
    On 2015-04-27 00:06, Greg Rudzinski wrote:
    > Carly,
    > I think we better just focus on your latitude by LAN (local apparent
    > noon) observation of the Sun from Sisal Mexico (Lat. 21° 10' N) for
    > now. If the Sun's declination was 23° 26' north (very close to summer
    > solstice) then the sextant Hs should have had a reading of 87° 35' at
    > LAN with an azimuth of 360° (due north). Your Hs at 41° 10' is too
    > far off to be a mistake even. If you were there during the winter
    > solstice then the declination would be 23° 26' south and the sextant
    > Hs would be 45° 16' with an azimuth of 180° (due south) and no
    > natural horizon to work with if you were at the beach. Were you on a
    > boat ? What was the date and UT (GMT) time of observation ?
    > Greg Rudzinski
    > FROM: Carly Butler
    > DATE: 2015 Apr 26, 23:47 +0100
    > Ok…here goes…
    > Took me longer than anticipated to dig this out of the mess that is
    > currently my studio. I have other sheets of calculations, but these
    > are the ones I wrote out for myself again to try and help me with the
    > next ones (clearly, not successfully!).
    > I was actually in Sisal Mexico (not the middle of the Gulf of Mexico!)
    > Phew, now a deep breath and to hit send...
    > Thanks everyone!
    > Carly
    > ps - is anyone on this forum in or around Nova Scotia? I would love to
    > find some in person help or a class around here...
    > View and reply to this message [1]
    > Links:
    > ------
    > [1]
    > http://fer3.com/arc/m2.aspx/Art-Navigation-Rudzinski-apr-2015-g31144

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