Aside from an ordinary clock...
2007-08-04 20:22:02 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Physics
A cesium atomic clock will get you the closest, at present.
An important point to mention when you say "exact time" is that time passes differently for two different observers. Due to general relativity, we measure what is called "perfect time," or the apparent time that has passed for a particular observer, not absolute "time," which nothing is able to measure.
2007-08-05 04:14:46 · answer #1 · answered by AJ R 3 · 0⤊ 0⤋
An atomic clock measures time very accurately. It's based on vibrating cesium atoms.
Yahoo is currently freaking out when I post links to Wikipedia, but you can look up more information there.
2007-08-05 03:31:18 · answer #2 · answered by lithiumdeuteride 7 · 0⤊ 0⤋
Whatever you mean by ordinary, consider the thousands of types of non-ordinary clocks.
2007-08-05 11:05:21 · answer #3 · answered by Fred 7 · 0⤊ 0⤋
atomic clock or an atomic wrist watch
2007-08-05 03:25:12 · answer #4 · answered by Jake F 2 · 0⤊ 0⤋
digital clock
2007-08-05 03:29:25 · answer #5 · answered by Anonymous · 0⤊ 0⤋