NavList:

You should first check the index corrcetion for your Luna sextant to see if some of your error is there. Next, Don't judge the amount of intercept as the same the amount of error. Intercept values vary with the DR longitude chosen and also with the various methods of sight reduction you use. Publications 249, 229, 208 and direct solutions with the law of cosines may have diffrent intercepts with identical data. I would also withold judgement until you get a sight with absolutely no surface disturbance on the reflecting liquid. The judgement of the instant of tangency is always subjective and moreso when the brain has to "work around" a shaky image. The amount of error could be in something as simple as not holding the sextant vertially of aligning the images to far off to the side of the field of view. Other members may have more examples of error sources. Best of luck.
Kind Regards, Randy
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