Assertion: unit's definition | /r/HasProperty | derived
Facets:
value: from the roentgen unit
type: OTHER
value: originally
type: MANNER
value: from the earth's circumference
type: OTHER
Source sentences:
text: The definitions of both the nautical mile and the kilometre were originally derived from the Earth's circumference as measured through the poles.
text: Where possible, definitions of the base units were developed so that any laboratory equipped with proper instruments would be able to realise a standard without reliance on an artefact held by another country.
text: Earlier definitions going back to 1945 were derived from the roentgen unit, which was named after Wilhelm Röntgen, a German scientist who discovered X-rays.