# NavList:

## A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

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Re: Exercise #18 Daylight 3-body fix.
From: Michael Dorl
Date: 2009 Mar 01, 10:22 -0600
m_burkes{at}MSN.COM wrote:
```Hi Michael, very interesting method! I obtained 34 17.8N,128 53.1 via
HO 229 and hand plot. Fix is center of "cocked hat" with triangles of
5,3,and 3 miles.
Mike Burkes
626-833-1521
```

Just for fun, I applied a -0.1 minute refraction correction and iterated my solution but saw little effect.  The result being...

Aires = 100.7797  Time offset =      0
Star               Decl         SHA       GHA          Alt          T_Day    D  M Year   T_Year     C_GHA  Aires
venus           -11.458      24.675    231.409    44.257    6.717      6  1 2009    126.717    231.409206.734
moon             18.985    324.715    171.641   35..643    6.729      6  1 2009    126.729    171.641206.926
sun                -22.473     72.556    279.758   16.737    6.748      6  1 2009    126.748    279.758207.202

Star1           Star2              Lat1       Lng1        Lat2         Lng2
venus           moon             34.283   230.891   -33.262   187.350
venus           sun                34.284   230.995   -42.148   192.391
moon           sun                34.193   230.892   -29.648   196.831
Average location               34.2532 230.9260

Or 34d15m12s north     230d55m34s west   or  129d4m26s east

Again, I did not allow for movement of the ship.  In the equal altitude plot below, red is venus, blue is the sun, and green the moon.  I note the ship is moving roughly south along the green moon line so I'd say the red venus and green moon intersection and the blue sun and red venus intersection should should be moved south by about 20 seconds of latitude which will tend to reduce the triangle.

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