在金木水火土五大行星中，水星堪称"最神秘的隐士"。因为它离太阳太近，大部分时间都被淹没在太阳的光芒里，想一睹其真容难度极高。而2月20日，人 们将迎来今年第一次水星的最佳观测期。 水星将迎今年首次最佳观测期 水星是太阳系八颗行星中离太阳最近的一颗。从地球上看，水星总是在太阳两边来回摆动，就像小孩被套上防走失绳，被太阳牢牢牵着，不能走远。 北京天文馆高级工程师 寇文：水星在太阳两边来回摆动，最大不会超过一个角度。当水星在太阳的东边，角度达到最大的时候，这时候就叫东大距。东大 距实际上是傍晚的时候，我们朝西方天空看，太阳落山以后，水星顶多看半个小时可能就落下去了。 水星不仅离太阳最近，而且是个头最小的行星，它最特别之处在于没有大气层保护，表面布满了和月球相似的环形山，就像一颗"裸露的岩石星球"。 北京天文馆高级工程师 寇文："土星合月"这是20日，到了24日，月亮会来到一个特殊的天体叫昴星团，也就是金牛座的一个疏散星团，我们叫七姐妹星 团。中国古代称它是二十八宿之一的昴宿，所以叫昴星团。视力良好者能看到六七颗小星聚集在很近的一片天区内。 不过，这次月球与昴星团的"相遇"发生在白天，等到天黑我们能看到星星的时候，月 ...

Core Points - Mercury will reach its western elongation on December 8, providing a rare opportunity for astronomy enthusiasts to observe and photograph the planet in the southeastern sky before dawn [1][3] - Mercury is the hardest planet to observe due to its proximity to the Sun, which often obscures it in sunlight [3][4] - The term "greatest elongation" refers to the maximum angular distance of an inferior planet (Mercury and Venus) from the Sun as viewed from Earth, with western elongation occurring when the planet is positioned west of the Sun [3] Observation Conditions - This year, Mercury has three western elongations, with favorable observation conditions in August and December [4] - Around December 8, Mercury will be approximately 17 degrees above the horizon at sunrise, with a brightness of about magnitude 0, marking the last opportunity to observe it until February 2026 [4] - Ideal observation conditions include selecting locations away from obstructions like buildings and trees, preferably in open areas or elevated sites [4] - The best time for observation is about one hour before sunrise during the week surrounding December 8, when the sky is beginning to brighten but Mercury remains visible [4] - While Mercury is visible to the naked eye, using binoculars can significantly enhance the chances of successful observation [4]