水星、火星、月球23日空中“相遇”，上演“双星拱月”

Core Points - A rare astronomical event called "double star and crescent moon" will occur on October 23, featuring Mercury, Mars, and the crescent moon in close proximity in the southwestern sky [1][7] - Mercury will reach its eastern elongation on October 30, marking the last opportunity for observation this year, although conditions will be poor due to its low altitude [2] - Mars, known for its reddish appearance due to iron oxide, will also be visible in the southwestern sky shortly after sunset, but the observation window will be brief [5][7] Summary by Sections - Astronomical Event: The conjunction of Mercury, Mars, and the crescent moon will take place on October 23, creating a visually striking formation [1][7] - Observation Conditions: Mercury's eastern elongation on October 30 will provide a final chance for observation this year, but it will be challenging due to its low elevation of less than 10 degrees [2] - Mars Visibility: Mars will be positioned in the southwestern sky at sunset, but the viewing time will be limited [5][7] - Viewing Recommendations: Observers are encouraged to find a flat, unobstructed area for the best chance to view the event, although binoculars may be necessary due to the low altitude of the celestial bodies [7]