Great explanation, thank you. From the links you provided (all very good), I started browsing and ended up with the book "Orbital Mechanics: Theory and Applicat

Great explanation, thank you. From the links you provided (all very good), I started browsing and ended up with the book "Orbital Mechanics: Theory and Applications" by Tom Logsdon [1], which appears quite good. [1] https://www.amazon.com/Orbital-Mechanics-Applications-Tom-Logsdon/dp/0471146366/ref=sr_1_1?s=books&ie=UTF8&qid=1486922811&sr=1-1&keywords=9780471146360 https://www.amazon.com/Orbital-Mechanics-Applications-Tom-Lo...