解码年度最大满月 11月5日可观测

Core Points - The second "supermoon" of the year will occur on November 5, 2023, marking the closest and largest full moon of 2025 [1] - The phenomenon of "supermoon" occurs when the full moon is at its perigee, making it appear larger and brighter than usual [3][6] Group 1: Supermoon Characteristics - A "supermoon" is defined by two main criteria: it must be full and near [3] - The average distance between the Earth and the moon during a supermoon is about 14% larger in visual diameter and 30% larger in visual area compared to the smallest full moon of the year [6] Group 2: Timing and Patterns - The average cycle for the moon to reach perigee is approximately 27.55 days, while the average cycle for a full moon is about 29.53 days, leading to a gradual shift in the dates of the largest full moons each year [9] - The dates of the largest full moons have been observed to drift later each year, typically by 13 or 14 synodic months [9] Group 3: Visibility of the Moon - Due to tidal locking, it is commonly believed that only 50% of the moon's surface is visible from Earth, but in reality, about 59% can be observed over time [12] - The moon's elliptical orbit and slight tilt allow for a phenomenon called libration, which enables observers to see slightly different portions of the moon's surface during different phases [13]