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Starburst effects can add an interesting element to a photograph. In a dark scene, it can add a dreamy, peaceful twinkle to the lights. In a daytime scene, a starburst sun can add drama and interest (Diy Photo Lighting)
This chart shows the effect of aperture on the size of the starbursts. As you can see, the smaller the aperture, the more emphasized the starburst. The same concepts apply during the daytime as they do during the night time.