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I glanced up another day and saw the Aurora Borealis.
At my latitude.  Indoors.  By daylight.

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The shallow glass bowl of my birdbath was spending the winter as a decoration in the living room.  While cleaning the room, I happened to set the bowl down under a window where sunlight could reflect from the bowl and then from the ceiling.

The Northern Lights came to mind when I glanced up at the reflections on the ceiling, and I later darkened the gray look of the dimly lit white ceiling to accentuate the effect.

The adjective [serendipitous] was coined long after people stopped speaking Latin routinely.  I guess that either [serendipita] or [serendipitis] would work, if the Vatican ever wants to modify a feminine noun with a Latin version of [serendipitous] in a papal bull.  I went with the one that sounds better and looks less like a spelling error.