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Arthur,

Oops, I confused two output parameters from my program. The value of 24' / h
which I have quoted is the topocentric apparent motion of the moon w.r.t.
the celestial sphere, i.e corrected for parallax and refraction. It is
irrelevant in this context. The change in distance to the sun is indeed 21'.
The two values differ in two respects: 1. The moon is not moving exactly
into the direction of the sun. 2. The sun itself moves east at a speed of
2.5' / h. Sorry for the confusion.

Herbert Prinz



Arthur Pearson wrote:

> * Regarding hourly rate of change in distance: for the Jan. 10 lunar I
> got 21', Herbert 24', Fred 27'. I still get 21'/hour, but this is for
> the apparent distance after correction for parallax and refraction. For
> the geocentric distance, I get an hourly change of 28' for the Jan. 7
> lunar, 27' for the Jan. 10 lunar. This seems to explain the difference
> with Fred, still not sure with Herbert.

   

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