Hunters figured out that if they chose an appropriately-sized target to mimic the vital zone — an 8-inch circle for instance, for a deer — they could also calculate the maximum distance at which they ...

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Jackson, K. and Hart, L. (2026) The Status of the Gravimetric Geoid across Nigeria. International Journal of Geosciences, 17, 49-65. doi: 10.4236/ijg.2026.171004 .