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Greg
Do you know how big that collimation error is when using a ghost ring
and not looking through it straight?
Bill

On Sun, 14 Jun 2020 at 18:46, Greg Rudzinski  wrote:
>
> David,
>
> When making an observation without an optic it is easy to be off on line of 
sight (collimation)  when using just a ghost ring. A sight tube is a much 
better way to keep things centered. Remember to apply index error to the 
artificial horizon sextant reading then divide by 2 before applying the 
refraction correction. Of course there is no dip correction for height of 
eye. The beauty of the artificial horizon observation is that there is no 
uncertainty due to height of eye, anomolous horizon refraction, or 
perpendicularity. Systematic errors are also cut in half when the observation 
is divided by 2. So expect LOPs to be closer to the actual position vs. using 
a natural horizon.
>
> Greg Rudzinski
>
> 

   

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