Mmastodon ScienceSpace first seen 1 d ago, last 4 h ago, peak #1

Rare Anticrepuscular Rainbow Fan Photographed in the Sky

Original: "A Fan-tastic Sign From Heaven" October 20, 2026 An Anticrepuscular Rainbow Fan * Credit & Copyright: Aurelia Degli Espo

Astrophotographer Aurelia Degli Esposti has captured an unusual optical phenomenon: an anticrepuscular rainbow appearing only as a sunlit fan-shaped fragment rather than a full arc. Such rainbows form opposite the sun and are rarely seen, let alone photographed in this partial form. Sky watchers and science enthusiasts are sharing and discussing the image, admiring both its rarity and the explanation of the atmospheric conditions behind it.

Why now: A rare and visually striking atmospheric optical phenomenon was captured and explained, drawing wide interest.

Aurelia Degli Esposti

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Rank over time, top of the chart is #1. 26 snapshots from 1 d ago to 4 h ago.

Evidence

• "A Fan-tastic Sign From Heaven" October 20, 2026 An Anticrepuscular Rainbow Fan * Credit & Copyright: Aurelia Degli Esposti Explanation: This is an unusual rainbow. For one thing, the rainbow is not complete, appearing only in a sunlit fan -- but that by itself is not very… · grobi@defcon.social · 35

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