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RE: Some P4 moon landing ideas :-)

> The high gain antenna wouldn't need any steering to look back 
> at Earth, once
> it was set.  The Moon is in a tidal lock with Earth and is 
> ALWAYS showing
> the same side to us.  Aiming a gain antenna to lock in would 
> be relatively
> easy since once the aim is set, you'd never have to move it again!

That is only true for relatively low gain antennas (with a beamwidth of
greater than 10-20 degrees).  The Earth does move around a bit in the lunar
sky, due to libration.

Someone a while back posted an excellent link which had calculations of how
much the Earth moved around the lunar sky.

Also, as a bit of trivia, it is possible to see 59% of the lunar surface
from the Earth, if you observe the Moon for long enough as it "rocks"
around. :)

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