Time and tide: pendulum clocks and gravity tides

Agnew, Duncan C.

doi:https://doi.org/10.5194/hgss-11-215-2020

Articles | Volume 11, issue 2

https://doi.org/10.5194/hgss-11-215-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue:

Developments in the science and history of tides (OS/ACP/HGSS/NPG/SE...

https://doi.org/10.5194/hgss-11-215-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 11, issue 2

16 Sep 2020

| 16 Sep 2020

Time and tide: pendulum clocks and gravity tides

Duncan C. Agnew

Data sets

Tidal Gravity Variations Measured by a Fedchenko AChF-3 Precise Pendulum Clock Duncan Agnew https://doi.org/10.5281/zenodo.3978746

Short summary

Tides from the Moon and Sun change the force of gravity. Pendulum clocks that use pendula are affected by this, but the resulting time errors are less than a millisecond over a day. These errors were measured by a few precision pendulum clocks between 1929 (the first data showing tidal gravity signals) and 1985. This paper shows the original results of each measurement and also compares these with simulations using modern tidal models.