Inertia question

1. The problem statement, all variables and given/known data

Which of the following is an inertial frame of reference when the measuring sensitivity in not very high?
1. A frame of reference fixed to the Sun and its axes are pointing toward 3 other stars.
2.A frame of reference fixed to a laboratory table.

2. Relevant equations

3. The attempt at a solution
Im not sure about the sun. Any ideas?

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