Time scales

Category:Time scales - Wikipedia

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Time zones

Hafele and Keating flew caesium clocks around the world in 1971 and the two directions were wrong in opposite ways Astronomy forced the world to standardise time long before any other science did Who is legally responsible when a national time signal goes wrong? Why physics needed a second that does not depend on the rotation of the Earth What happens to software that assumes every minute has exactly 60 seconds? Why servers log in UTC while every bug report arrives in local time Spanner's TrueTime buys causality with atomic clocks and an explicit uncertainty window Flight plans run on UTC while the departure board shows local time How does one laboratory in Paris average hundreds of atomic clocks into a single time? Why the same list of dated events can support two defensible orderings There is no global now in a distributed system and NTP cannot manufacture one How is a leap second inserted and who signs off on it? Why do timestamps in logs sometimes jump backwards? What makes an atomic clock wrong by only one second in a hundred million years? Why does UT1 keep sliding away from atomic time?

Seasons Horology Time measurement systems History of timekeeping Time Management Future Timeline Calendars Time in life Historical eras