john,

I told you WRONG. Distance between knuckles is 2 1/2 degrees

45 minus 23 1/2=21.5 That would be
2 fists and 1 3/4 knuckles observed on the Noon gmt sighting

On the 30 mile would be a 5/8 of a Knuckle. a little better than halfway
between the top of a knuckle and the hollow between Knuckles.

Each knuckle to knuckle is 21/2 degrees=150 miles
Knuckle to hollow between knuckles=11/4 degree or 75 miles
Half that distance (knuckle to hollow) 5/8degree=27 miles

You can set them up;
Fist is 10 degrees
Distance between Knuckles is 2 1/2 degrees; 1/2 a fist is 5 degrees

When talking miles it is really rough ballpark figures but will get you
within 30 miles

Get your Fist out there and then you figure the fractions of that
observed fist