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NASA’s Astronomy Picture of the Day for Oct. 29, 2026, features an image of Venus seen almost directly between Earth and the Sun. NASA’s explanation says sunlight refracted and scattered by Venus’s atmosphere forms a bright crescent whose tips extend beyond a half-circle and are known as the planet’s “horns.”
NASA’s Astronomy Picture of the Day for Oct. 29, 2026, features Venus as a slender, glowing crescent and explains why the bright arc can extend beyond a half-circle. The planet is shown almost directly between Earth and the Sun, a viewing geometry in which sunlight passing through and scattering in Venus’s atmosphere illuminates the crescent’s tips, called its “horns.”
The NASA Science explanation describes the featured view as Venus seen almost directly between the Sun and Earth. In that position, the planet displays a crescent phase, much as the Moon does when it is near its new phase. Unlike the new Moon, however, Venus’s atmosphere can scatter and refract sunlight around the edge of the planet, making the illuminated arc appear to stretch beyond 180 degrees.
The ends of the extended arc are known as the horns of Venus, according to the APOD explanation. The text says Venus reaches this near alignment about once every year and a half. The image is credited to photographer Thierry Legault; NASA lists Cecilia Chirenti, Robert Nemiroff, Jerry Bonnell and Keighley Rockcliffe among the authors and editors.
NASA says the crescent may be seen with small telescopes or binoculars during twilight. It adds that exceptionally acute eyesight might be enough to see it without optical aid. That is a qualified possibility in the source, not a claim that the crescent is readily visible to the unaided eye. The page presents the image and an astronomer-written explanation as part of APOD’s daily feature.
How Venus’s Atmosphere Shapes Its Crescent
The image illustrates that a planet’s appearance depends not only on its phase but also on its atmosphere. The Moon’s new phase is dark from Earth’s perspective, while Venus’s atmosphere can refract and scatter sunlight around the planet’s limb, producing the extended luminous arc described in NASA’s explanation. The horns make this atmospheric effect visible in a distinctive way.
For observers, the feature offers a practical reason to look at Venus during twilight with suitable optical equipment. It also connects a familiar sight—a bright point in the evening or morning sky—to the changing geometry of the Earth, Venus and the Sun. APOD is an educational image feature rather than a report of a new observation or a change in Venus’s status; its value here is explaining what the image shows and how to interpret it.
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A Familiar Planet in Changing Phases
Venus is often noticed for its brightness, but the NASA explanation emphasizes that it also passes through visible phases. The phase changes as Venus moves around the Sun relative to Earth, altering how much of its sunlit side faces us. When Venus appears close to the line between Earth and the Sun, the visible illuminated portion is a narrow crescent.
NASA compares this arrangement with the geometry of a new Moon, which occurs monthly when the Moon is near the direction of the Sun in the sky. The comparison is about alignment; the source distinguishes the outcomes because Venus’s atmosphere scatters sunlight around its edge. The APOD text also points to historical interest in the planet: it says ancient Babylonian astronomers may have been among the first to study changes in Venus’s brightness, and notes astronomical records in other cultures, including the oldest surviving Maya book.
Limits of the Viewing Guidance
The source page does not provide technical details about the photograph, such as the telescope or camera used, the exposure, or the exact time and location of the observation. It also does not specify the crescent’s apparent size or brightness, or give viewing directions for a particular location. Those details cannot be inferred from the page’s general note about twilight observing.
NASA frames unaided viewing as something that may be possible for exceptionally acute eyesight; it does not establish that most observers can see Venus’s horns without equipment. The page also does not provide a separate observing forecast or say how long this particular appearance will remain observable. Its statement that the alignment occurs about every year and a half is the supplied general cadence, not a date-specific forecast.
The Next Daily Astronomy Picture
APOD’s page says “Tomorrow’s picture: What’s next?”, indicating that another image and explanation are scheduled for the following day. The Oct. 29 entry does not announce a related mission event, new measurement or future observation campaign. Readers seeking to observe Venus will need current local sky conditions and timing information beyond what this APOD page provides; the page itself recommends binoculars or a small telescope during twilight.
Key Questions
What are the horns of Venus?
They are the tips of Venus’s crescent when its illuminated arc extends beyond 180 degrees. NASA attributes the appearance to sunlight refracted and scattered by the planet’s atmosphere.
Why does Venus look like a crescent?
Venus shows phases because its position relative to Earth and the Sun changes how much of its sunlit side is visible from Earth. In the featured view it is almost directly between the two.
Can the Venus crescent be seen without a telescope?
NASA says exceptionally acute eyesight may be enough, but recommends a small telescope or binoculars during twilight. The source does not suggest that unaided viewing is reliable for everyone.
How often does Venus reach this alignment?
The APOD explanation says Venus is seen almost directly between Earth and the Sun about once every year and a half. It does not give a specific date for the next occurrence.
Source: science.nasa.gov
