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I'm working my way through the Moon-Mars example now from Part 2 and I'm not
feeling too sure of myself. I feel pretty good about my calculated D1 and D2,
65.459 and 65.920 respectively. But, I'm wrestling with using Letcher's method
to find D and I'm outside of that range. I'm subtracting semidiameter  and Mars'
paralax from the lunar distance and I end up with a D of 65.406. Can anyone give
me some hints?

Chuck Griffiths


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