NavList:

Hello George,

Thank you very much for your kind reply.

Your computed value of the "displacement of that light-barycentre from the planet's centre [being equal to] r ( 1 - k ) * 8 / 3pi , which works out to be r ( 1 - k ) * 0.85 " also perfectly matches the Nautical Almanac data.

In my quoted example for 15 Jan 1982 for which the NA quotes a value of 0'4 to account for the phase effect, the Planet Semi-diameter is 0.51' while the "Point P elongation" from the Planets' geometrical center reaches the value of 0'50.

When we multiply the "Point P elongation" by your computed factor equal to " 8 / 3pi ", we get the value of 0'42 which is exactly the same as the 0'4 value quoted by the Nautical Almanac.

I have not taken the time to check your integration computation and result, but the latter seems much better than the one I did perform many ... many Moons ago.

TO THE ATTENTION OF FRANK :

After all, this contribution I poured into this "DSLR Venus Lunar" originated from my "trial and error initial guessing" of your own way to compute the Planets phase correction.

I would certainly appreciate your own comments here.

Thanks in advance, Frank, and

back to your attention George, thank you again for your very valuable help.

Best Regards to all,

Kermit

Antoine M. "Kermit" Couëtte

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