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  2. Atom (time) - Wikipedia

    en.wikipedia.org/wiki/Atom_(time)

    With that meaning, it was later referred to in Medieval philosophical writings as the smallest possible division of time. The earliest known occurrence in English is in Byrhtferth 's Enchiridion (a science text) of 1010–1012, [ 2 ] where it was defined as 1/564 of a momentum (1½ minutes), [ 3 ] and thus equal to almost 160 milliseconds.

  3. Atomic clock - Wikipedia

    en.wikipedia.org/wiki/Atomic_clock

    BeiDou Time (BDT) is a continuous time scale starting at 1 January 2006 at 0:00:00 UTC and is synchronised with UTC within 100 ns. [ 139 ] [ 140 ] BeiDou became operational in China in December 2011, with 10 satellites in use, [ 141 ] and began offering services to customers in the Asia-Pacific region in December 2012. [ 142 ]

  4. Fifth Virginia Convention - Wikipedia

    en.wikipedia.org/wiki/Fifth_Virginia_Convention

    The Constitutional Conventions of Virginia from the foundation of the Commonwealth to the present time. John T. West, Richmond. ISBN 978-1-2879-2059-5. Tartar, Brent (2013). The Grandees of Government: the origins and persistence of undemocratic politics in Virginia. University of Virginia Press. ISBN 978-0-8139-3431-0.

  5. Caesium standard - Wikipedia

    en.wikipedia.org/wiki/Caesium_standard

    The first set of units defined using the caesium standard were those relating to time, with the second being defined in 1967 as "the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom" meaning that:

  6. Time in physics - Wikipedia

    en.wikipedia.org/wiki/Time_in_physics

    In the International System of Units (SI), the unit of time is the second (symbol: s). It has been defined since 1967 as "the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom", and is an SI base unit. [12]

  7. Fifth grade - Wikipedia

    en.wikipedia.org/wiki/Fifth_grade

    Fifth grade (also 5th Grade or Grade 5) is the fifth or sixth year of formal or compulsory education. In the United States, this is mostly the last grade of primary school, but for some states, it could be the first year of middle school. Primary school generally goes from Kindergarten and ends in fifth or sixth grade. Students in fifth grade ...

  8. Timeline of drafting and ratification of the United States ...

    en.wikipedia.org/wiki/Timeline_of_drafting_and...

    March 25 • Maryland–Virginia conference convenes Initially scheduled to assemble in Alexandria, Virginia on March 21, delegates representing the states of Maryland and Virginia gather at Mount Vernon, the Fairfax County home of George Washington, to address navigational rights in the states' common waterways. [1]

  9. List of Schoolhouse Rock! episodes - Wikipedia

    en.wikipedia.org/wiki/List_of_Schoolhouse_Rock...

    Like the two newly-produced "America Rock" music video were released in 2002, none of the "Earth Rock" music videos were aired on television. This (last) season was released direct-to-video. Between songs 8 and 9, "The Energy Blues" is featured.

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