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On September 13, Venus and a 9%-illuminated waxing crescent moon will appear close together in the western sky at sunset, positioned less than 10 degrees above the horizon and visible for approximately one hour after sunset. The following day, September 14, observers across parts of Europe, Africa, and Asia will witness a lunar occultation where the moon passes directly in front of Venus in the daytime sky beginning at 5:26 a.m. EDT. Venus is currently approaching its maximum brightness as an evening star, set to peak on September 18.
Why it matters
This celestial event provides an accessible opportunity for casual sky watchers to observe two bright solar system objects in close proximity, with the rare occultation offering a dramatic astronomical phenomenon for millions of observers in specific geographic regions. The low equipment requirements make it an ideal introduction to observational astronomy for beginners.
Understand the Science
Look west at sunset on Sept. 13 to see brilliant Venus shining close to the delicate arc of the crescent moon. The encounter is a prelude to an even closer meeting the following day, when the moon will pass directly in front of Venus for observers across parts of Europe, Africa and Asia.
Tonight (Sept. 13), Venus will appear as a bright “Evening Star,” a little over 5 degrees from the 9%-illuminated waxing moon — roughly the width of your three middle fingers held at arm’s length against the evening sky.
Venus, often referred to as “Earth’s twin” as a result of its similar size and rocky composition, will be easy to spot as a dazzling point of light in the evening sky, while the moon will be a trickier target, with its barely illuminated disk all but lost in the glare of the setting sun.
The moon and Venus will shine less than 10 degrees above the horizon at dusk, so find a spot with a clear view to the west to give yourself the best chance at catching the solar system pairing before they follow the sun out of view a little over an hour after sunset.
The moon and Venus will shine less than 10 degrees above the horizon at sunset and will be visible for less than an hour before the lunar disk follows our parent star below the late summer skyline. Find a spot with a clear view to the west and start scanning the sky as soon as the sun sets to give yourself the best chance at catching the solar system pairing. You can discover the exact timings for sunset for your location using Time and Date’s sunset tracker.
Look out for earthshine brightening the unlit side of the lunar disk, as sunlight reflects off our planet to bathe the moon in a subtle glow, revealing ghostly details on the moon’s otherwise unlit side. The phenomenon is best viewed on nights surrounding the new moon phase, when Earth is well positioned to bathe its natural satellite in reflected sunlight.
For around $50 you can grab these beginner binoculars for better views of craters and seas on the lunar surface. 10x is enough for a closer look without worrying about excessive shakes during handheld observation.
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Millions of stargazers across parts of Europe, North Africa, the Middle East and southern India will be positioned to see the moon pass directly in front of Venus in the daytime sky starting at 5:26 a.m. EDT (0926 GMT) on Sept. 14, according to in-the-sky.org. Remember: It’s never never safe to point a telescope or binoculars at the sun, as doing so can lead to permanent damage to your vision.
The moon and Venus will be below the horizon for viewers in the U.S. as the occultation takes place. By the evening of Sept. 15, the waxing crescent will appear to have leapt to the left of Venus as it nears the point of maximum brightness in its current evening apparition on Sept. 18.
Want to photograph the crescent moon near Venus for yourself? Then check out our guide to photographing the lunar surface with a DSLR or mirrorless camera, along with our roundups of the best lenses and camera bodies for astrophotography.
Editor’s Note: If you would like to share your astrophotography with Space.com’s readers, then please send your photo(s), comments, and your name and location to spacephotos@space.com.
Source: Don't miss Venus shine beside the crescent moon at sunset tonight