[time-nuts] GPS Antenna on Tower.

[Mark Sims]

I just added the ability to calculate solid earth tides and the vertical gravity offset due to the sun and moon to Lady Heather.   The lat/lon offset is typically around +/- 60 cm per day.    Vertical offset is around  +/- 180mm.  Depending upon the day and where you are, the swings are not symmetrical around 0.0   

Solid earth tides are a BIG factor in precision geodesy.   Gravity offset is a big issue for precision pendulum nuts.  If your pendulum clock cannot detect gravity offsets (very few can) it's not nutty enough.

The attached plot shows around 5 days of data.

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>  Since 1cm of motion is equivalent to 30ps, there's probably not
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