[time-nuts] Pendulums & Atomic Clocks & Gravity
jmfranke at cox.net
Sat May 26 18:47:51 EDT 2007
Doppler is zero only if you are at the center of the Earth. Those of us on
the surface, there is Doppler from the surface velocity around the center.
----- Original Message -----
From: "Neville Michie" <namichie at gmail.com>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Sent: Saturday, May 26, 2007 6:10 PM
Subject: Re: [time-nuts] Pendulums & Atomic Clocks & Gravity
> Look up Lagrangian points on Wikipedia.
> There are points of zero gravitational force, about our planet. What
> is more, these points are stationary with respect to Earth, so
> Doppler effects would be zero.
> As the distance from Sun to Earth to Moon varies through the year it
> follows that the distance from Earth of these points must vary on a
> small scale.
> These points are good for satelites as the orbit never decays.
> cheers, Neville Michie
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