Jupiter's Moons and Mercury's Visibility Highlight April 2 Sky Events
On April 2, sky watchers in the U.S. have the opportunity to observe a series of celestial events involving Jupiter and Mercury. Jupiter's four Galilean moons, including Europa and Callisto, will be visible as Europa passes north of Callisto. Additionally, Ganymede's shadow will transit across Jupiter's cloud tops, providing a striking view for observers, particularly in the western half of the U.S. where the view is less obstructed by Jupiter's low position. Meanwhile, Mercury becomes visible in the early morning sky, reaching its greatest western elongation on April 3. The planet can be seen shining at magnitude 0.4, rising around 5:45 A.M. local daylight time, and appearing 4° above the eastern horizon about half an hour before sunrise. Mars and Saturn are also present in the morning sky, though Mars is faint and requires optical aid to be seen. 
