3 ms·
Fun fact: This is easy to remember if you know that the kilometer was originally defined so that the distance from the equator to the poles was 10000 kilometers
by IvyMike 12y ago
Fun fact: This is easy to remember if you know that the kilometer was originally defined so that the distance from the equator to the poles was 10000 kilometers. https://en.wikipedia.org/wiki/Metre#Meridional_definition https://en.wikipedia.org/wiki/Metre#Meridional_definition
- turnip1979 12y agoNeat. So 10000km = an "arc" from the equator to a pole. If you assume the Earth is a sphere, the circumference at the equator = 4 * 10,000.