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The Breakthrough Starshot project aims to send centimeter-sized, gram-scale"StarChip" probes to Alpha Centauri at a speed of $\sim0.2c$. On the otherhand, Zhang \& Li recently proposed that trans-relativistic cameras may be sentto any direction to study astronomical objects and test special relativity. Toconduct such "relativistic astronomy", one needs to solve the motion of theprobe in flight. We solve the motion of the probe (including the movingdirection and the velocity) by comparing the positions of three or more pointsources observed in the Earth rest frame and in the probe's comoving frame.When the positions of enough point sources are taken into account, the motionof the probe can be solved with an error which is even smaller than thediffraction limit of the transrelativistic camera. After solving the motion,when the measurement of the position of an additional point source isintroduced, one can use the data to test the light aberration effect in specialrelativity. The upper limit of the photon mass can be placed from the deviationof aberration to slightly lower than the energy of the photon, e.g. $\sim 1 \rm{eV}$.

Relativistic Astronomy. II. In-Flight Solution of Motion and Test of Special Relativity Light Aberration