So something I'm asked a lot regarding
the gimbal video is: if it's just a glare,
if it's just some kind of glare in the
camera, then how can the glare rotate
when the horizon doesn't rotate? How can
the glare rotate independently of the
horizon? Now it's actually not that
complicated. Now the way the camera is
mounted it has to rotate when it goes
over zero degrees, when it's going over
the forward-facing direction, just
because of the way it's mounted, because
of the gimbal system, This is an unwanted
rotation. So what they do is they have a
thing called a derotation mechanism
that levels out of the rotation to make
it so that the horizon is the way it
should be, which is level to the actual
horizon as seen by the pilot. So this 
derotation mechanism is applied after the
actual rotation of the camera to remove
the unwanted rotation so let's see what
that looks like if we have this little
camera here and we rotate it and say
that's an unwanted rotation and we want
to remove this unwanted rotation. We just
apply a derotation to it. In this case I
just used a motion tracker to remove, to
track the motion and remove the rotation.
So we've derotated it here, which gives
the horizon, my garage door here, remains
steady and the glare itself rotates
because the glare is a function of a
part of the camera and if we are
rotating the camera the glare rotates
relative to the horizon. And so if we
then apply this derotation to get the
horizon steady the horizon doesn't
rotate and the glare does rotate. So that
explains what's going on in the gimbal
UFO video the glare is rotating because
the camera is rotating. The horizon isn't
rotating because they don't want it to
rotate. The rotation is unwanted, a
function of the gimbal system the
derotation rotates the glare and that's
what we're seeing here. You can try this
yourself
