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    Re: Low Altitude Setting Sun Sight
    From: Stan K
    Date: 2017 Sep 9, 21:05 -0400
    With Celestial Tools I got 1.1 Away at standard temperature (50ºF) and 0.6 Away at 70ºF.

    Stan


    -----Original Message-----
    From: Greg Rudzinski <NoReply_Rudzinski@fer3.com>
    To: slk1000 <slk1000---.com>
    Sent: Sat, Sep 9, 2017 4:50 pm
    Subject: [NavList] Re: Low Altitude Setting Sun Sight

    Bruce,
    I get 1.2' away using a Palm app.  Well done on the observation !  Low altitude observations will do in a pinch. Even sunrise and sunset timed observations without a sextant will get it done. On the ultra low observations there is the chance of abnormal refraction so use caution. I draw the line at about 4°. Anything below this will show an unfiltered Sun in the horizon mirror.
    Greg Rudzinski
    From: Bruce J. Pennino
    Date: 2017 Sep 9, 10:11 -0700
    Hello:
    During August I intended to take a normal sun sight, go for a walk, and watch the sun set over Cape Cod Bay. I was delayed by errands and traffic, and arrived at Cooks Brook Beach, Eastham,MA, USA as the sun had almost set. Beach parking lot {at} 41d 51.9 N 70d 0.5 W. I was quite surprised how good the sight came out.  For those interested, the data are below.  I wondered about the accuracy of the refraction data.  The Hs and time data are the mean of two sights ,sun LL.
    Date: August 19,2017          Height of eye about 14 ft.     IC = 0.0
    Time:   23:09:10        Air temp about 70 F
    Hs = 3 d 35.0 '      (three degrees plus 35.0')    I normally avoid sights below 8-10 degrees.   Knowing the latitude, a time sight calculation gives good longitude.
    Best regards to all.
    Bruce
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