NavList:

David, the book you're looking at by Hosmer represents a brief fashion in the history of nautical astronomy/celestial navigation. Around the time of the First World War, these solutions with "azimuth tables" were relatively popular. Before we get into it further, I just want to verify that this historical method is what you're interested in. The chapter you pointed us to is titled "Sumner lines" but it's probably a bit euphemistic here. Do you want to learn about the math used to calculate Sumner lines originally? Do you want to learn about the math for lines of position generally? Or are you, in fact, interested in puzzling out this specific type of analysis from 1918? Whatever your answer is, I'm game to discuss it. I just want to get a better idea of what aspect of this you're interested in. Thanks.

-FER

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