Nice! We have a shape layer containing two identical circles. Now we need to align them relative to each other and to document. First, select both circles using shape selector tool (A). You will notice that buttons on top toolbar are enabled. Click the Align Horizontal Centers button. Next, select Layer 1 (white background), link it with shape layer (notice the chain link icon next to shap layer), then select Move tool (V) and again, click Align Horizontal Centers button. The result - our shapes are perfectly aligned!

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We need 12 circles, but we only have 2 now. Duplicating shapes is super easy - select them (dont forget about shape selector tool, A key), copy (Ctrl-C), Paste (Ctrl-V) and rotate (Ctrl-T). After you hit Ctrl-T, you will get some input fields on top toolbar. Find Angle field, and enter 30.

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A bit of layer effects wouldnt hurt - I thought and added some. Feel free to experiment. If you're interested, here's what I added: stroke (1px wide), inner glow (1px wide), gradient (radial, black-to-white, overlay mode).
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Now we need to make this shape "fade". For this, we will use <b>Fill layer</b>. Menu Layer -> New Fill Layer -> Gradient.

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It will be gradient layer with the following settings:
- white - to - transparent
- style: angle
- angle: 75 (well, 77, nevermind :-)

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