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Stop asking about verticals lines read comments : "In order to study the velocity of the shockwave front, rocket trails were located perpendicular to the line of site and the shockwave was photographed as it passed in front of these trails. The progress of the shockwave was then followed by observing the "hooks" in the rocket trails at the shock front. These hooks are due to the change in the index of refraction of the air at the shock front." 

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current19:09, June 13, 2015Thumbnail for version as of 19:09, June 13, 2015480 × 269 (16 KB)Oniontree1 (wall | contribs)created video


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