Make sure your angles are in units of radians (not degrees), where 2π radians = 360 degrees. But after that you will get the ...

I don't know where he got this idea (surely not from the internet), but Eratosthenes estimated the radius of the Earth by looking at two shadows at two different locations on the Earth. This diagram ...

An international team of scientists working with the Event Horizon Telescope project have been able to measure the radius of a black hole for the first time. It was in 1781 that astronomer Charles ...

A discrepancy in the measured size of the “deuteron” increases the chance that something is amiss in our understanding of atoms. The same group that discovered a curious discrepancy in measurements of ...