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Re: Exercise #18 Daylight 3-body fix.
From: Michael Dorl
Date: 2009 Mar 01, 10:22 -0600
From: Michael Dorl
Date: 2009 Mar 01, 10:22 -0600
m_burkes@MSN.COM wrote:
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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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.
--~--~---------~--~----~------------~-------~--~----~
Navigation List archive: www.fer3.com/arc
To post, email NavList@fer3.com
To , email NavList-@fer3.com
-~----------~----~----~----~------~----~------~--~---