Moon Occults Venus on June 17, Hiding It for About 1 Hour Over Santa Barbara

Q: This Wednesday, Venus will vanish behind the Moon in broad daylight. What do you need to see this rare celestial event safely?

To watch Venus disappear behind the Moon safely in daylight, you need a clear view of the eastern sky, a shaded spot to keep the Sun out of your eyes, and extreme care with any optics. The event can be seen with the naked eye only under very good conditions because Venus is bright, but binoculars or a small telescope will make it much easier to spot. The key safety rule is simple: never point binoculars, a telescope, or a camera anywhere near the Sun unless the instrument has a proper solar filter mounted over the front. Unfiltered optics can cause permanent eye damage almost instantly. If you use solar protection, it should be certified for solar viewing. Solar filters for telescopes or binoculars must fit securely over the objective lens, and eclipse glasses should meet the ISO 12312-2 standard. Regular sunglasses are not safe for this purpose, and eclipse glasses must not be used while looking through binoculars or a telescope. For the best view, observers in Santa Barbara should look almost due east, with the Moon about 33 degrees up. Venus is expected to vanish around 11:36 a.m. PDT and reappear about 12:42 p.m. Finding a shaded location that blocks the Sun is the safest practical setup for this daytime occultation. Experienced observers may use a telescope to see Venus’s gibbous phase, but caution is essential throughout.

Q: A celestial event that helped rewrite history happens this Wednesday. Can you witness the phases of Venus that shocked Galileo?

Yes. If you use binoculars or, better, a small telescope, you should be able to see Venus in a gibbous phase during Wednesday’s lunar occultation — one of the same kinds of phases Galileo observed in 1610 when he gathered evidence that Venus orbits the Sun. In Santa Barbara, the key moment comes around 11:36 a.m. PDT on June 17, when the Moon’s dark edge covers Venus and the planet appears to vanish in the daytime sky. Venus should reappear about 12:42 p.m. PDT from the Moon’s bright edge. The Moon will be low in the eastern sky, about 33 degrees up, near azimuth 85 degrees. What you are likely to see is not Venus’s dramatic thin crescent, but a bright gibbous disk, about 74% illuminated and roughly 15 arcseconds across. That still matters historically: Galileo’s breakthrough was not one single phase, but the fact that Venus shows a changing set of phases at all, from crescent to gibbous to nearly full, which contradicted the old Earth-centered model. The event is visible across much of North America, though exact times vary slightly by location. A shaded viewing spot helps block the Sun’s glare. Never point binoculars or a telescope anywhere near the Sun without proper solar safety. If conditions are good, this occultation offers a rare chance to watch Venus “wink out” and to glimpse the kind of planetary phase that helped rewrite astronomy.

Q: Why is Wednesday's 'Great Daytime Occultation' of Venus considered one of the top skywatching events of the entire year?

Wednesday’s daytime occultation of Venus is considered one of the year’s standout sky events because it combines rarity, visibility and spectacle in a way few astronomical events do. The main draw is that observers can watch Venus, the brightest planet in the sky, disappear behind the Moon and then reappear about an hour later while both are still visible in broad daylight. That is unusual: Venus is bright enough at about magnitude -4.0 to be seen in a blue sky, and the Moon will be only a thin waxing crescent, making the “wink out” especially dramatic. It is also a favorable setup. Venus will be about 38 degrees from the Sun, far enough away to make the event much easier to observe than many solar-adjacent daytime phenomena, provided viewers carefully block the Sun and never point binoculars or a telescope near it. Through optics, observers may also see Venus’s gibbous phase, adding scientific and visual interest. The event is notable for its reach. It will be visible across much of North America, giving a large number of people a chance to see a relatively rare lunar occultation of Venus. Astronomers have also described it as one of the last especially favorable Venus occultations for much of the contiguous United States, northern Mexico, southern Canada and the Caribbean until the 2029–2031 period. That mix of rarity, broad accessibility and the striking sight of the sky’s two brightest objects after the Sun meeting in daylight is why it ranks so highly.

1 articles · Updated · Santa Barbara Edhat · Jun 14

11:36 a.m. PDT is the key viewing time in Santa Barbara, when the waxing crescent Moon is expected to fully cover Venus within about two minutes.
Venus should reappear around 12:42 p.m. PDT from behind the Moon’s illuminated edge, ending an occultation lasting roughly one hour.
11:30 a.m. PDT, the Moon will sit almost due east at azimuth 85 degrees and altitude 33 degrees, with Venus near the shadowed side at about the 5:30 position.
Blue daytime sky will hide the Moon’s dark limb, making Venus seem to wink out abruptly; shaded viewing and binoculars or a telescope can improve visibility.
Times are based on Noleta and may shift by about 1 minute for locations more than 50 miles away, with planetarium apps offering local estimates.