I do understand what you were saying Flybyknight, which is why I used the equator.
Thanks Adam for the correction in terminology. I see where what I said may cause confusion.
What I was measuring on Google Earth was the the distance between my assumed position and known position (from my back porch) and then comparing that known difference with the result I got after reducing the sight. The difference between Ho and Hc was 1 degree 8' which should put me approx 68nm from my assumed position. What I really was interested in was whether the calculated distance off would jive with the known measurement. I went to double check the result on google earth the measured difference was about twice that. That led me to input the coordinates at the equator where 1' of longitude should be 1 nm. I wasn't getting that result which made me question if Google Earth was measuring distance correctly.
Thanks again Adam for you input, you obviously have a special interest celestial navigation.
Last edited by RandyBC; 05-01-2010 at 12:26 PM.