Step-by-step tutorial with project download. 
In this tutorial I use the Circle effect, Fractal Noise, Polar Coordinates and CC Light Rays to create a 2D solar eclipse. Rather than keyframe everything, I use Expressions to drive all the different effects based on just two keyframes. 


MoonPos = effect("Moon position")("Point")[0];
SunPos = effect("Sun position")("Point")[0];
MoonRadius = effect("Radius")("Slider");
if (MoonPos-SunPos < MoonRadius && SunPos-MoonPos < MoonRadius) {
    Width = thisComp.width/2;
    X = Width + linear(SunPos, Width-MoonRadius*0.05, Width+MoonRadius*0.05, MoonRadius*-1, MoonRadius)
} else {
    X = SunPos;
[X,effect("Sun position")("Point")[1]]

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