NavList:

Frank,

Thank you for the extensive response, it's much appreciated . . . very informative and thought-provoking. 

Re: my previous post, 'tread' s/b 'thread'. My bad!

Frank, you wrote: " . . . a solar eclipse is not a lunar . . . "

It seems I've always been too quick to 'dismiss' an eclipse as simply a special lunar case where LD = 0 and H_M = H_S. I'll need to re-think this, or at least re-work things. I've put it on my 'celestial' agenda to carefully work through (actually, back through) a lunar to see what the implications would be for things like horizontal parallax. I should see a reasonable level of "consistency" wherein (for example) "HP as an input" = "HP as an output". If not, then I'm about to learn something. Perhaps the eclipse time predicted for Eclipse Island may be as opportunity to obtain an implied HP value that could be compared with a predicted HP value. I'll not block up this discussion with my lunar misconceptions but perhaps I'll do so in an upcoming Navlist 'thread' that I'm almost certain will arise with respect to the April eclipse.

Thanks again for your response. 

Cheers,

Jim.