Given:
The second is 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 cesium 133 atom.  -- NIST, Dork Van de Psycho.

A year is 9,192,631,770  * 60 * 60 * 24 * 365.2425   periods of the
radiation corresponding to the transition between the two hyperfine levels
of the ground state of the cesium 133 atom. -- Wackypedia

"So if T = 5 years and v = 0.8c, then the stay at home twin will
have aged 10 years while his travelling twin sister will have aged
6 years."  -- Dork Van de Psycho.
 (5 years is 10 years or 6 years, I'm not sure which).

"Time is what a clock says" Dork Van de shithead.


Now for the stupid question.
What happened to the missing  1,160,365,758,078,260,000 periods of
the radiation  corresponding to the transition between the two hyperfine
levels of the ground state of the cesium 133 atom's prodigal twin sister?

-- 
Der alte Hexenmeister und Engineer
Androcles Dumbledore B.A., M.Sc., Ph.D.,
Headmaster, hogwarts.physics school for zauberlehrlings.
"One muggle's magic is another sorcerer's engineering"

  http://www.androcles01.pwp.blueyonder.co.uk/