The Tau Ceti traveler

The Tau Ceti traveler
The Tau Ceti traveler is a relativistic problem imagined by Dr. Richard Hachel and which consists of the study of the journey to Tau Ceti of an astronaut evolving in accelerated mode of approximately 10m/s², in order to maintain his ship in a sort of artificial gravitation.
The distance of Tau Ceti is set at twelve light years.
The departure is from the Cape Canaveral base in Florida.
We set:
a=1.052ly/y²
D=12al
We want to know when and at what speed the spaceship will cross the Tau Ceti system in the Earth's frame of reference.
We want to know at what speed Tau Ceti will cross the rocket, and at what time in the rocket's frame of reference.
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R.H. --
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