Comment Re:The size of a euro coin? (Score 1) 77
I was wondering how impressive it was and attempted to resolve this with trigonometry to find the likely error distance 1 light year away.
This got me in trouble with precision (the angle is of the order 1.0e-11 in Radians) but knowing that the angle is a constant here, the error should scale linearly with the distance.
If we use 400,000 km as the distance to the moon, 1 light years is roughly 2.0e7 times the distance to the moon (Google search calculator).
Thus an error of 20mm = 2.0e-5 km error at 400000 km should give around 2.0e7 * 2.0e-5 km =~ 400 km, meaning at 1 light years away, their error is roughly on par with how far away Ryan Air puts you from your real destination.