Re: Measuring acceleration of Earth

[John Denker <jsd@AV8N.COM>]

John Mallinckrodt wrote:
> The apparent gravitational
> field strength undergoes a relatively large (first order in the ratio
> of the radius of the Earth to that if its orbit) SEMI-diurnal
> variation due to the rotation of the Earth, and a MUCH smaller
> (second order) diurnal variation.

1) I assume (based on the general context of this thread) that
only solar (not lunar) contributions are being discussed.

2) The two terms alluded to above are entirely real, but (even
neglecting lunar contributions) they are not the whole story.

For a listing of the primary tidal components, see Table 1 in:
  http://csep1.phy.ornl.gov/om/node25.html