bflat Posted July 8, 2020 Author Share Posted July 8, 2020 Just now, peter said: I'm pleased your back ,you have certainly lived up to my expectations sorry for the sarcasm ,but really I didn't use o because observer started with it I used it as a point on the diagram I wanted to keep the explanation simple for you by not introducing an extra letter WHAT? We are concerned with the distance to the horizon. You simply cannot see Canada from NM unless you are much higher than the 100,000 feet I gave you. Quote Link to comment Share on other sites More sharing options...
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