How gravity field shortened our metre

@article{Vanicek2019HowGF,
  title={How gravity field shortened our metre},
  author={P. Vaníček and I. Foroughi},
  journal={Journal of Geodesy},
  year={2019},
  volume={93},
  pages={1821-1827}
}
We became interested in investigating the origin of the length of the metre as a basis of the metric system after reading Ken Alder’s 2002 book “The measure of all things”, where we learnt that the metre we use in all our length measurements is about 0.2 millimetres shorter than it was supposed to be. That does not sound like being too far off, but when one realizes that the metre was supposed to be one ten-millionth part of the Earth quadrant, the 0.2 mm translates to a 2 km error in the Earth… Expand

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