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NASA’s Astronomy Picture of the Day for Oct. 29, 2026, features an image of Venus near the line between Earth and the Sun. The accompanying explanation says sunlight scattered and refracted by Venus’s atmosphere produces a crescent that can extend beyond 180 degrees, forming the features known as its “horns.”
NASA’s Astronomy Picture of the Day on Oct. 29, 2026, features Venus viewed almost directly between Earth and the Sun, where the planet appears as a thin, glowing crescent. The NASA Science explanation says sunlight refracted and scattered by Venus’s backlit atmosphere can make the crescent extend beyond 180 degrees; its pointed ends are called the planet’s “horns.”
The daily feature explains that Venus has phases, just as the Moon does, because the portion illuminated by the Sun that is visible from Earth changes with the planets’ positions. In the featured alignment, Venus is nearly between Earth and the Sun. The page compares the geometry to a new Moon, while pointing out that Venus’s atmosphere makes the view different: rather than appearing dark, the planet’s rim can glow as sunlight passes through and scatters in its atmosphere.
According to the NASA Science description, the illuminated arc can reach more than 180 degrees. The tips of that extended crescent are known as the horns. The feature says the crescent can be observed with a small telescope or binoculars during twilight; it adds that people with exceptionally acute eyesight may be able to see it without optical aid. The page does not provide observing coordinates, a viewing schedule, or safety instructions for locating Venus near the Sun.
The image is credited to Thierry Legault. NASA lists Cecilia Chirenti, Robert Nemiroff, Jerry Bonnell and Keighley Rockcliffe among the authors and editors. The Astronomy Picture of the Day service is associated on the page with NASA’s Astrophysics Science Division at Goddard Space Flight Center, NASA Science Activation and Michigan Technological University.
How Venus’s Atmosphere Shapes Its Crescent
The feature connects a familiar sight in the sky with the geometry and atmosphere of another planet. Venus’s phases show that the planet is not always seen as a fully illuminated disk: from Earth, its visible sunlit portion changes as Venus moves around the Sun. Near the alignment described in the APOD, the planet is seen on the side facing away from the Sun, leaving a narrow crescent visible from Earth.
The unusual point is that the crescent’s visible arc may extend beyond a simple half-circle. NASA attributes this appearance to sunlight being refracted and scattered by Venus’s atmosphere. The horns are the ends of that extended arc, not separate features on the planet. For readers, the explanation offers a practical way to understand why Venus can look unlike the Moon even when both show a crescent phase.
The observing note also makes the image relevant beyond its visual appeal: the crescent may be within reach of modest optical equipment during twilight. However, the NASA page presents a general viewing description, not a location-specific guide. Visibility depends on where and when an observer looks, and the source does not give enough information to predict a particular viewing opportunity.
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Venus’s Changing View from Earth
The Oct. 29 entry is one installment of NASA’s Astronomy Picture of the Day, a daily feature that presents an astronomical image or photograph with an explanation written by a professional astronomer. This entry focuses on Venus’s phase and the atmospheric effect that can lengthen its apparent crescent.
NASA’s explanation says Venus passes through the described near-alignment about once every year and a half. It relates that arrangement to the monthly new-Moon alignment, while distinguishing the two appearances: the new Moon is dark from Earth’s perspective, but Venus’s atmosphere can scatter sunlight around the planet’s visible edge. The page also notes the historical study of Venus’s changing brightness, saying ancient Babylonian astronomers may have been among the first to investigate it and referring to astronomical records in other cultures, including the oldest surviving Maya book.
Viewing Details Are Not Specified
The APOD entry explains the image and the general viewing conditions, but it does not identify the photograph’s precise observing location, the date and time it was captured, the equipment used, or the planet’s apparent dimensions. It also gives no region-specific guidance for seeing the crescent on Oct. 29. The stated recurrence of about once every year and a half describes the alignment in general; it is not, by itself, a viewing forecast for a particular place.
The historical wording is also qualified: NASA says Babylonian astronomers may have been the first to study Venus’s brightness changes. The entry does not give further evidence or dates for that claim. Its reference to records from other cultures is brief and does not describe their contents.
The Daily Astronomy Feature Continues
The Oct. 29 page points readers to the next day’s Astronomy Picture of the Day with the teaser, “What’s next?” It does not disclose the subject of the Oct. 30 image in the supplied material. Readers seeking to observe Venus should consult a current, location-specific sky guide for its position and timing, rather than treating the APOD image as a forecast. Any observation should avoid pointing optical equipment toward the Sun.
Key Questions
What are the “horns” of Venus?
They are the tips of Venus’s crescent arc. NASA says the arc can extend beyond 180 degrees when sunlight is refracted and scattered by the planet’s backlit atmosphere.
Why does Venus appear as a crescent?
Venus has phases because the portion of its sunlit side visible from Earth changes as the planet moves around the Sun. In the alignment described by NASA, Venus appears nearly between Earth and the Sun.
Can Venus’s crescent be seen without a telescope?
NASA’s caption says it can be viewed with a small telescope or binoculars during twilight. It says unaided viewing may be possible for people with exceptionally acute eyesight, but does not guarantee visibility.
Does the APOD give a time and place to see Venus?
No. The entry gives general observing conditions but does not provide a location-specific schedule or directions. Viewing opportunities depend on the observer’s location and the planet’s position in the sky.
Source: science.nasa.gov
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