Get ready for an amazing sight, as the waxing crescent moon passes in front of — and briefly occults —the blue-white stars of the Pleiades on April 19. Here's how to watch the alignment unfold in real time online with this Virtual Telescope Project livestream.
The 7%-lit waxing crescent moon will pass over the Pleiades at 12:52 p.m. EDT (1652 GMT), during the daytime for viewers in the U.S. as the lunar disk glides unseen above the eastern horizon alongside the stars of the constellation Taurus, according to in-the-sky.org.
Viewers in Italy, on the other hand, will be perfectly positioned to witness the moon slip from the Pleiades in the hours following sunset, as the lunar disk arcs towards the western horizon, chasing the glow of the retreating sun.
When can I watch?
The Virtual Telescope Project's YouTube livestream will begin at 2 p.m. EDT (1800 GMT) on April 19, providing real-time telescopic views from its panoramic telescope as the crescent moon slips from the Pleiades in the skies over Italy, weather permitting.
"It will be a memorable sight involving our satellite, showing as a sharp crescent with its elegant 'earthshine' and one of the most iconic deep-sky gems, Messier 45," Virtual Telescope Project founder Gianluca Masi told Space.com in an email.
Earthshine occurs when sunlight bounces off our planet's cloudy atmosphere to strike the moon, bathing its unlit side in a subtle glow that can reveal the dark forms of lunar maria, vast plains where ancient lava once cooled and hardened into sweeping basaltic landscapes.
The occultation takes place just two days after the April 17 new moon. Earthshine is particularly easy to spot around this time and the relatively weak glow from the moon's sunlit crescent won't be enough to obscure the light of the Pleiades, as its stars — more than 1,000 in total —shine about 445 light-years away in the constellation Taurus.
Editor's Note: If you would capture a photo of the moon with the Pleiades and want to share it with Space.com's readers, then please send your photo(s), comments, and your name and location to spacephotos@space.com.
