news: 3db5ebb1$1@news.povray.org...
>     Well, while this is mostly true, near the edges (as seen from Earth),
> libration does allow some small rising and setting action.  >

Of course you're right, I knew about libration though I couldn't tell how
large is its influence.
I read latitude libration is cause by moon's axe tilt and longitude
libration by slightly elliptic orbit which changes orbiting speed while
rotating stays constant.
But I drift O.T. don't I? :-)

Marc

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