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NASA’s Astronomy Picture of the Day for Oct. 29, 2026, features a view of Venus near the line between Earth and the Sun. The agency explains that sunlight scattered and refracted by Venus’s backlit atmosphere can form a crescent extending beyond 180 degrees, with tips known as the “horns.”
NASA’s Astronomy Picture of the Day for October 29, 2026, features Venus seen almost directly between Earth and the Sun, where its backlit atmosphere can form a bright crescent extending beyond a semicircle. The image and accompanying explanation describe the crescent’s pointed ends as the “horns” of Venus, a viewing effect linked to sunlight refracting and scattering through the planet’s atmosphere.
The NASA Science explanation says Venus has phases, much as the Moon does, because observers on Earth see different portions of the planet’s sunlit side as Venus moves around the Sun. In the featured view, Venus is near the line between Earth and the Sun. Its illuminated side is largely turned away from us, leaving a narrow crescent against the dark sky.
Unlike a new Moon, which appears dark because it reflects little sunlight toward Earth, Venus can show a glowing arc of atmosphere. NASA says the planet’s backlit atmosphere refracts and scatters sunlight, making the visible crescent extend beyond 180 degrees. The arc’s tips are called horns. The explanation says the crescent can be seen with a small telescope or binoculars during twilight; people with exceptionally acute eyesight may be able to see it without an optical aid.
The picture is credited to Thierry Legault. NASA lists Cecilia Chirenti, Robert Nemiroff, Jerry Bonnell and Keighley Rockcliffe as authors and editors of the APOD entry. The page is presented as a service involving NASA’s Astronomy Picture of the Day operation, NASA’s Goddard Space Flight Center, NASA Science Activation and Michigan Technological University.
How Venus’s Atmosphere Shapes the Crescent
The image highlights a difference between Venus and the Moon that is easy to miss when both appear as slender crescents. The visible arc is not simply the outline of the planet’s solid surface: NASA’s explanation attributes its extended shape to sunlight interacting with Venus’s atmosphere. That makes the horns a visual clue to the planet’s atmospheric effects, as well as to its position relative to Earth and the Sun.
For readers, the practical point is that Venus’s phases are not limited to professional observations. NASA says the crescent can be viewed with binoculars or a small telescope during twilight, though observing Venus close to the Sun requires care. The APOD entry is an explanation of a celestial sight and an image, not a report of a new discovery or a claim that the planet has changed.
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Venus’s Changing View From Earth
Venus’s changing appearance follows its orbit around the Sun. As the planet shifts position, its apparent phase and apparent size change for observers on Earth: a thin crescent is seen when Venus is on the near side of the Sun from our perspective, while a fuller phase appears when more of its sunlit hemisphere faces Earth. The Oct. 29 APOD focuses on the near-alignment geometry, comparing it with the arrangement at a new Moon.
NASA says this near alignment occurs once every year and a half. The comparison with a new Moon is about relative positions, not identical appearances: the Moon does not display Venus’s bright atmospheric arc in the account. The APOD also notes that ancient Babylonian astronomers may have been among the earliest to study Venus’s changes in brightness, which are related to its phases. It mentions astronomical records from other cultures, including the oldest surviving Maya book, but gives no further details about those records.
Limits of the Image and Viewing Advice
The APOD page does not provide technical details about how the image was captured, such as the equipment, exposure, observing location or processing. It also does not give a precise date or time for the depicted observation. The stated once-every-year-and-a-half interval describes the recurring near-alignment in the explanation; the entry does not say that the image was taken on Oct. 29, 2026.
Visibility to the unaided eye is framed cautiously: NASA says it may be possible for people with exceptionally acute eyesight. The page does not provide a specific observing location, forecast or safe viewing procedure. Because Venus appears near the Sun in this geometry, readers should not infer that looking toward the Sun is safe; the entry itself does not offer detailed solar-observation instructions. The historical statement about Babylonian astronomers is also hedged, rather than presented as a settled claim about who first observed the changes.
The Next Daily Astronomy Picture
NASA’s APOD format features a different space image or photograph each day with an explanation written by a professional astronomer. The Oct. 29 entry points readers to “What’s next?” and indicates that another picture is due the following day. The supplied page does not identify that next image or describe any further Venus-related announcement.
Readers interested in seeing Venus’s crescent can use the APOD explanation as a starting point, then consult reliable local observing guidance for timing and safe conditions. NASA’s page does not specify when or where the pictured view can be reproduced, so visibility will depend on the observer’s location, the planet’s position and twilight conditions.
Key Questions
What are the “horns” of Venus?
They are the tips of Venus’s crescent. NASA says the backlit atmosphere refracts and scatters sunlight, allowing the arc to extend beyond 180 degrees.
Why does Venus appear as a crescent?
Venus has phases because its position around the Sun changes how much of its sunlit side is visible from Earth. Near the alignment shown in the APOD, most of the illuminated side faces away from us.
Can the crescent be seen without a telescope?
NASA says it can be observed with binoculars or a small telescope during twilight. The explanation says unaided viewing may be possible for people with exceptionally acute eyesight, but does not promise that it will be visible to everyone.
Does the APOD say the image was taken on October 29, 2026?
No. October 29, 2026, is the APOD publication date. The page credits Thierry Legault but does not state when or where he made the image.
Source: primary
