NavList:

Greg,

I'm getting a little better at taking a noon sight.

I've read at length the replies concerning using an AH and using an Upper Limb or Lower Limb observation....but am still confused.

Now I take the Lower Limb of the Sun and put it tangent to the Upper Limb of the reflected Sun from my AH.

What correction do I apply in that case?

I found this- http://astro.ukho.gov.uk/data/na2003/bookmark03.pdf

....which mentions UL and LL in the Apparent Altitude columns.

Do I use that?

Or....per the serveral other posts about this topic, do I simply subtract Refraction and continue onwards with the other calculations like this?

Here are the steps I use

1- Measured Altitude at LAN

2- +/- Index Error

3- Result= Hs

4- Subtract Refraction

5- Result= Ho

6- Subtract Ho from 90 D

7- The result is Zenith Distance

8- Add Declination (assuming it's "Same name")

9- Result= Latitude at LAN

Thanks again,

Sam