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Science
Jun 21, 2026
Analyzed by GPT OSS 120B

Twilight Conjunction of Crescent Moon and Bright Venus Lights Up June Sky

AI Summary
A thin crescent moon will share the western twilight sky with a bright Venus on 17 June 2026, offering a striking conjunction visible from the UK and the Southern Hemisphere. The moon will be just three days old, showing only 11 % of its disc, while Venus appears less than a moon’s width away.

A thin crescent moon will share the western twilight sky with a bright Venus on 17 June 2026, offering a striking conjunction visible from the UK and the Southern Hemisphere.

Celestial Pairing: A Crescent Moon Meets Venus in Cancer

The moon, just over three days old, will appear as a silver sliver while Venus shines brightly less than a moon’s width away. Both objects will be positioned in the constellation Cancer, visible low in the western sky after sunset.

Numbers Behind the Nightshow: 11% Illumination and 3‑Day‑Old Moon

  • Moon age: ~3 days
  • Illuminated fraction: 11 %
  • Venus magnitude: approximately -4 (bright beacon)
  • Angular separation: < 0.5° (less than a moon’s width)

Observing the Event: Best Viewing Strategies for UK and Southern Hemisphere

  • UK: Look west around 21:45 BST from a clear horizon; the pair will be low.
  • Southern Hemisphere: The conjunction appears earlier and higher, making it easier to spot.
  • Use binoculars only after the sun has set completely to avoid eye damage.
  • Watch for Earthshine on the dark portion of the moon as the sky darkens.

Why This Conjunction Captivates Skywatchers

The combination of a young crescent moon, bright Venus, and the subtle Earthshine creates a rare visual contrast that appeals to both casual observers and amateur astronomers. Such close angular proximity is uncommon, offering a natural laboratory for studying atmospheric scattering and lunar illumination.

Looking Ahead: When to Expect the Next Prominent Moon‑Venus Pairing

Similar close moon‑Venus alignments occur roughly every 584 days, the synodic period of Venus. The next notable conjunction after June 2026 is expected in late November 2027, when Venus will again appear near a waxing crescent moon.