Emanating from the sun and — as I discovered to my delight while processing the image in Lightroom — reflected from the cyclist’s helmet:

A wonderful, serendipitous convergence of circumstances recorded by the camera’s lens.

“Do not the Rays of Light which fall upon Bodies, and are reflected or refracted, begin to bend before they arrive at the Bodies; and are they not reflected, refracted, and inflected, by one and the same Principle, acting variously in various Circumstances?”

~Isaac Newton