[time-nuts] GPS Antenna on Tower.
kb8tq at n1k.org
Tue Jun 20 20:10:39 EDT 2017
Earth tides are at least as crazy a topic as time. There are formulas that will let you incorporate
the effect of Pluto on solid Earth tides.
> On Jun 20, 2017, at 7:21 PM, Peter Vince <petervince1952 at gmail.com> wrote:
> Hi Mark,
> This is all new information to me - and fascinating! Have you just
> "calculated" the offsets (using known values from somewhere), or "measured"
> it by very long term averaging of the GPS position information?
> Peter Vince
> On 20 June 2017 at 17:34, Mark Sims <holrum at hotmail.com> wrote:
>> 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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