How to pronounce “shimmering”(noun) in English

So this the schematic of how an adaptive optics systems works to remove the turbulence in the atmosphere which causes that kind of twinklingor shimmering of the stars. The light comes into this system, and this is a deformable mirror. It can change its shape 2,000 times a second.And this is a wavefront censor, and it says what optical affects the atmosphere has induced into the images of the star. So you can see the star's jittery from the