Perhaps it would have been better had I written “which VALUE is part of a system of immense antiquity” (compared to the VALUE of the metre, which as you say, is very slightly in error - partly owing to the oblate sphere of the earth) I had already read your post and I have also read his book and discussed this topic with Neal. My intention, if you read carefully what I have written, is merely to introduce to this forum a well-researched publication on metrology, not to debate whether one system is better than another. Mechain and Delambre (surveyors, 1793) were attempting to find an accurate value of the meridian, a fraction of which would be the basis for the Metric system. The advantage of the polar axis, if it could be accurately determined, is that it is fixed, whereas the meridian varies: that is the point made by the author.
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