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A comment on Gravitational waves detected by LIGO. Parent comment

Re:Gravitational waves detected by LIGO by kryptiskt on Thursday February 11, 2016 @09:27AM (#11080272)
Only if your interested in the distance, parallax measurements do that by measuring when the Earth in on different sides of the sun.

If you're only after direction you can measure the time skew between signal hitting detector one and two.As you know the speed (same as light), and that the wavefront is parallel, you have a pretty good idea where in the sky the wave came from.

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Re:Gravitational waves detected by LIGO by SideburnsOfDoom on Thursday February 11, 2016 @10:56AM (#11080844)
For the first case, you would need a signal that lasts for at least half a year. Does that cover two black holes merging?
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Re:Gravitational waves detected by LIGO by davrosthedalek on Thursday February 11, 2016 @12:06PM (#11081382)
Well, technically, they black holes circle each other for billion of years. So with instruments sensitive enough, you could do that. Unfortunately, LIGO and the others are only sensitive enough to see the last few parts of a second, when the signal is strongest.
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