Pendulum Clocks and Gravity

Ethan Siegel tells why the first pendulum clock transported to America did not keep accurate time. Earth's gravitational constant is an average which actually changes slightly with latitude!

-DD

Perfect Clocks

Michael Cooney reports that DARPA is seeking highly accurate timepieces to reduce travelers' reliance on Global Posibitioning satellites .

-DD

Computer Clock

Simson Garfinkel wrote an article on the "Security Implications of the Humble Computer Clock " in 2009, but his advice is still relevant. I have found that errant clock settings have prevented users from accessing apps such as e-mail. Checking the accuracy of a computer's internal clock should be an early step in a intractible networking problem.

-DD