On my pre-dawn walks each morning, I gaze up into the dark sky, mesmerized by the moon as it appears in different shapes over the course of a month.

Earlier this week I saw the thinnest sliver of a moon hanging over the rooftops, a fingernail moon, the faintest outline of white drawn around the edge of the sphere’s shadow like a piece of iridescent twine, giving the moon a three-dimensional depth that I don’t recall seeing before.

Its striking appearance in...

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