Group 1 - The article discusses a rare astronomical event where Mercury, Mars, and the crescent moon will closely "gather" in the southwestern sky at sunset on October 23, described as a "double star and crescent moon" phenomenon [1][6] - Mercury and Mars are well-known planets, with Mercury being the closest planet to the Sun, often hidden in its glare, making it difficult to observe except during its greatest elongation [1][2] - The event will occur shortly before Mercury's eastern elongation on October 30, which is noted to be the last opportunity for observing Mercury this year, although conditions will be poor due to its low altitude of less than 10 degrees above the horizon [2] Group 2 - Mars will be positioned highest in the sky during the event, followed by Mercury, with the crescent moon being the lowest [6] - Observers are encouraged to find a flat, unobstructed area for viewing, as the low altitude of the celestial bodies and their proximity to the horizon will make them challenging to see without binoculars [6] - The visibility of this event is limited due to the short observation window and the influence of sunlight, making successful observation a rewarding challenge [6]
水星、火星、月球23日空中“相遇”上演“双星拱月”
Xin Hua She·2025-10-21 03:45