New at actionscript please help

Can someone please explain this code to me in detail.
this is the part I really don't understand. I know that this
code work I just don't know how. Thanks
function snow(a, n) {
for (var i = 0; i < n; i++) {
var star:MovieClip = this.createEmptyMovieClip("star" + i,
i);
star._x = Math.random( ) * 550;
star._rotation = (Math.random( ) * 2 * a) - a

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