geology, geography and geometry

Yesterday, I posted twice. In the first post I mentioned the book Alex through the looking glass by Alex Bellos and in the second I mentioned the delight of finding that two words are actually related, or actually not. This morning, something happened to combine both those ideas. To explain what, I have to flash back several decades.

Possibly in my last year of high school, when some of my classmates were studying geology and others were studying geography, I used the little Greek I had picked up to figure out that geo-logy was the study of earth/land and that geo-graphy was ‘drawing’ it. Possibly because geometry was not a final year high school subject in its own right (it was a sub-subject of mathematics), I didn’t think about it as well. Also, modern-day geometry has very little connection with land.

But ancient geometry did. Bellos writes, ‘The historian Herodotus was the first to use the word ‘geometry’, or earth-measure, describing it as a practice devised by Egyptian tax inspectors to calculate areas of land destroyed by the Nile’s annual floods’.

(Compare and contrast astro-nomy, the ‘naming’ of stars, and astro-logy, the ‘study’ of ‘stars’, where the modern disciplines have diverged and refocused.)


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