Re: practicing with sextant on land
That was exactly it, the moon wasn't on the meridian. Glad to know I wasn't as far out as I thought. I'm looking forward to more practice this weekend.
I'll have to check a printed copy of the Nautical Almanac to see if the Android App "Celestial" includes all the data. Still lots to learn yet. I've done surveying with compass and chain but that's 2D and things on the ground don't move, whereas celestial navigation is 4D (3D with time) plus the objects don't stay still.