Friday, July 25, 2025

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Moon to Temporarily Block Seven Sisters Stars on July 20

Moon's waning crescent phase will occult Pleiades stars July 20, 2025

From Hacker News Original Article Hacker News Discussion

On July 20, 2025, the waning crescent moon will pass in front of the Pleiades star cluster, temporarily blocking these stars from view across parts of the U.S. and Canada.

Why it matters: This natural lunar occultation offers a unique, naked-eye stargazing opportunity without needing telescopes or binoculars.

The big picture: The Seven Sisters eclipse occurs monthly and is part of a regular orbit cycle, visible only from select locations each time.

Stunning stat: The Pleiades cluster contains over a thousand young stars about 445 light years away, many visible to the naked eye.

Commenters say: Readers reflect on cultural connections like the Māori Matariki celebration and liken the event to sci-fi themes from Isaac Asimov’s Nightfall.