The methods of analyzing space, time and motion described in the previous several lectures are called kinematics. Galileo rightly deserves much of the credit for developing these methods. [Although ...

Special relativity, even though it's over 100 years old, is still one of the most puzzling and perplexing discoveries about the nature of the Universe itself. The (Newtonian) laws of physics that ...

VLBI is the only technology that permits determination of positions on Earth with a direct relationship to a celestial reference system. The International Celestial Reference Frame (ICRF) is an ...

You say there is no such thing as “centrifugal force” (1 March, p 47). Yes, there is – in the right frame of reference. There is, of course, no centrifugal force in an inertial frame of reference (in ...