Time has two aspects. For civil and some scientific purposes, we want to know the time of day so that we can order events in sequence. In much scientific work, we want to know how long an event lasts. Thus, any time standard must be able to answer two questions: “When did it happen?” and “What is its duration?" - Jearl Walker
PHARAO will become the first cold-atom clock ever to orbit Earth, operating outside the International Space Station. Does this mean the station’s crew will be able to measure time more accurately than on Earth?
You are students ? Emphasize your research topic or your passion for literature, graphic arts, photography, video. Participate now in TimeWorldPoster or TimeWorld Art!
“What then is time? When not ask me I know but once you ask me and I try to explain it, I do not know. How can the past and the future be, when the past no longer is, and the future is not yet? As for the present, if it were always present and never moved on to become the past, it would not be time, but eternity." St. Augustine
Can we say that the universe is 13.8 Ma years old?
Is Time the same for everyone?
How long is one day on other planets?
We know how long an Earth day is, but how about the other planets in our solar system? How long does it take for those planets to spin one full rotation? And what is the best way to show the answer to this question?
Lire la suite...