年度最小上弦月和最大下弦月为啥总“挨着来”？

Core Viewpoint - The largest waning crescent moon of the year will occur on August 16, with the moon positioned near its perigee, approximately 370,000 kilometers from Earth [1][4]. Group 1: Moon Phases - The waning crescent moon appears as a half-moon shape and will be visible in the night sky after midnight on August 16, resembling a reversed "D" [1][7]. - The phenomenon of moon phases, including the waning crescent, is influenced by the relative positions of the sun, Earth, and moon [4][7]. Group 2: Size Comparison - The upcoming waning crescent moon is considered the "largest of the year" because it is near the perigee, making it appear larger than the smallest waning crescent moon of the year, which is about 9.2% smaller in visual diameter [7][11]. - The moon's elliptical orbit causes variations in distance from Earth, leading to the largest and smallest appearances of the waning crescent moon [7][11]. Group 3: Observation Tips - To observe the largest waning crescent moon, it is recommended to wake up early before dawn, as it rises in the late night and is best viewed before sunrise [14].