July skywatching reveals the dance of planets and the glow of our galaxy
July 2023 offers a rare celestial display as Mars and Venus part ways in the evening sky. Meanwhile, the early morning belongs to Jupiter and Saturn, and the dark nights of the new moon provide the perfect window to witness the faint, majestic core of the Milky Way galaxy.
Throughout July 2023, observers can track the shifting positions of Mars and Venus. While they begin the month appearing close together in the western sky after sunset, they gradually drift apart and descend lower toward the horizon. A highlight occurs on July 9 and 10, when Mars passes near the blue-white star Regulus. Because Mars is currently at its dimmest point of the year, it shares a similar brightness with the star, making the contrast in their reddish and blue-white hues easily visible to the naked eye or through binoculars.
The early morning hours are dominated by the giant planets Jupiter and Saturn. Jupiter appears significantly brighter than Saturn, a difference attributed to both its proximity to Earth and its closer position to the Sun, which results in greater illumination. Saturn, meanwhile, is accompanied by the bright star Fomalhaut. At approximately 440 million years old, Fomalhaut is a relatively young star. Recent observations from NASA's Webb Space Telescope have unveiled a complex structure of three distinct debris belts surrounding the star, likely sculpted by the gravitational influence of unseen planets.
For those seeking deeper space views, July is an ideal time to observe the Milky Way. Away from the interference of city light pollution, the galaxy's core appears as a faint, diagonal band of light in the southern sky once darkness fully sets in. The new moon on July 18 is particularly advantageous for this, as the absence of moonlight prevents fainter celestial features from being washed out. Whether watching the Moon pass by Mars on July 20 or tracking Mercury's low appearance in the latter half of the month, the July sky serves as a reminder that every star is a sun potentially orbited by its own family of worlds.
