space.com
Sep 4, 2026
Venus is becoming a thinner crescent — and that’s when it finally starts making sense
AI-summarised brief · reviewed before publication
Venus is transitioning from a bright, nearly full disk to a thinner crescent this September, with its illuminated fraction dropping from 36% to 32% as it approaches inferior conjunction on Oct. 24. The planet’s apparent size increases because it is moving closer to Earth, reaching its greatest eastern elongation on Aug. 15 and peak brightness (magnitude –4.8) on Sept. 18. Astronomers and amateur stargazers can observe the changing phase with small telescopes, offering a clear view of Venus’s orbital geometry.
💡 Why It Matters
- · The visible phases of Venus confirm its orbit around the Sun, a key evidence that helped overturn the Ptolemaic model in the 17th century.
- · Observing the planet’s crescent now provides a tangible demonstration of planetary motion for both scientists and the public.
