[time-nuts] GPS Antenna on Tower.

Bob kb8tq 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.
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.

More information about the time-nuts mailing list