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TAI is a weighted average of the time kept by over 450 atomic clocks in over 80 national laboratories worldwide. [3] The majority of the clocks involved are caesium clocks; the International System of Units (SI) definition of the second is based on caesium. [5] The clocks are compared using GPS signals and two-way satellite time and frequency ...
Unix time is not a suitable way to represent times prior to 1972 in applications requiring sub-second precision; such applications must, at least, define which form of UT or GMT they use. As of 2009, the possibility of ending the use of leap seconds in civil time is being considered. [12]
The problem of funding a public preschool occurs not only from limited sources but from the cost per child. As of 2007, the average cost across the lower 48 states was $6,582. [39] Four categories determine the costs of public preschools: personnel ratios, personnel qualifications, facilities and transportation, and health and nutrition services.
The Doomsday Clock has moved closer to midnight than it has ever been, and is now just 90 seconds away from striking 12, scientists have said.
1.8 ks: The time slot for the typical situation comedy on television with advertisements included 2.28 ks: The duration of the Anglo-Zanzibar War, the shortest war in recorded history. 3.6 ks: The length of one hour (h), the time for the minute hand of a clock to cycle once around the face, approximately 1/24 of one mean solar day
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100: 1.67 minutes (or 1 minute 40 seconds) 10 3: kilosecond: 1 000: 16.7 minutes (or 16 minutes and 40 seconds) 10 6: megasecond: 1 000 000: 11.6 days (or 11 days, 13 hours, 46 minutes and 40 seconds) 10 9: gigasecond: 1 000 000 000: 31.7 years (or 31 years, 252 days, 1 hour, 46 minutes, 40 seconds, assuming that there are 7 leap years in the ...
The dual-slope conversion can take a long time: a thousand or so clock ticks in the scheme described above. That limits how often a measurement can be made (dead time). Resolution of 1 ps with a 100 MHz (10 ns) clock requires a stretch ratio of 10,000 and implies a conversion time of 150 μs. [13]