Last Sunday we hitched a ride with the AUC guys down to Silicon Valley. It was the same as last year’s tour: Fry’s (the small one) where I bought an SSD and some Altoids; the Computer History Museum, which was smaller and less impressive than last year but they still have the mechanical difference engine which is great; and Apple HQ at 1 Infinite Loop, where I bought a T-shirt, a shirt for work, and a microphone/button for my phone.
Time is traditionally accounted for by counting periodic motion of a planetary mass in the solar system. One rotation of Earth is a day, one revolution about the sun is a year. In the current era, it has its progress tracked by atomic clocks, the principles of which is founded upon the periodic motion of subatomic particles. I recall learning at one point in school that the relevant international standard is based on energy transitions of a particular isotope of caesium, and identifying over nine billion periods of its radiation as one second.