AI Insight
On September 15, 2026, the Moon occulted (passed in front of) Venus as observed from Cessy, France during daytime. Both celestial bodies displayed crescent phases in the same frame, with the Moon showing approximately 10 percent illumination and Venus showing about 25 percent illumination. Despite Venus appearing as a smaller crescent percentage-wise, it appeared brighter due to its proximity to the Sun and highly reflective cloud cover compared to the Moon's dark surface.
Why it matters
This rare astronomical alignment demonstrates the predictability of celestial mechanics and provides educational opportunities for understanding planetary phases and relative brightness. Such occultations are visible to only about 10 percent of Earth's population during any given event, making documented observations valuable for public engagement with astronomy.
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A Daytime Eclipse: Moon Occults Venus
There was something behind the clouds. Upon close inspection, it was the Moon, which was hard to see yesterday around noon above the small village of Cessy, France. But soon, it was not only the Moon. As expected, a bright dot suddenly appeared from behind the Moon — the planet Venus far in the distance. Captured in the single featured exposure, both appeared to show a crescent phase. The Moon’s crescent was quite slight — with only about 10 percent of its face illuminated by the Sun. In contrast, Venus’s crescent was more full — showing about 25 percent illumination. Venus appeared brighter because it is nearer the Sun and because its clouds are more reflective than the dark lunar surface. An occultation of Venus by the Moon is visible to only about 10 percent of the Earth, but in yesterday’s event even most of that was experiencing daytime.
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Tomorrow’s picture: galactic eye
| Date | September 15, 2026 |
|---|---|
| Credit & Copyright | Arnaud Mariat |
| Authors & editors: | Robert Nemiroff, Jerry Bonnell, Cecilia Chirenti, Keighley Rockcliffe |
| A service of: |
ASD at NASA / GSFC, NASA Science Activation & Michigan Tech. U. |
Source: APOD: 2026 September 15 – A Daytime Eclipse: Moon Occults Venus