天文·每日一图——夏至的满月
文摘
2024-07-02 08:54
广东
Image Credit & Copyright: Tunc Tezel (TWAN)Explanation: Rising opposite the setting Sun, June’s Full Moon occurred within about 28 hours of the solstice. The Moon stays close to the Sun’s path along the ecliptic plane and so while the solstice Sun climbed high in daytime skies, June’s Full Moon remained low that night as seen from northern latitudes. In fact, the Full Moon hugs the horizon in this June 21 rooftop night sky view from Bursa, Turkey, constructed from exposures made every 10 minutes between moonrise and moonset. In 2024 the Moon also reached a major lunar standstill, an extreme in the monthly north-south range of moonrise and moonset caused by the precession of the Moon’s orbit over an 18.6 year cycle. As a result, this June solstice Full Moon was at its southernmost moonrise and moonset along the horizon.
影像提供与版权: Tunc Tezel (TWAN)说明: 这轮在日落时升起的六月满月，东升的时间点与夏至相去不到28小时。由于月亮皆徘徊在太阳视运动所在的黄道面附近，所以当北纬地区夏至白天的太阳高悬时，那晚的六月满月就会低垂。如这6月21日拍摄于土耳其布尔萨市的屋顶夜空影像所示，月出到月落之间每10分钟记录一次的月迹，皆出现在地平线附近。2024年的月亮位于大至点，这是由月球轨道为期18.6年的进动周期，每个月所造成的月出和月落的南北仰角极限。也因此，这次六月夏至的满月，是最贴近地平线的最南月出和月落。（major lunar standstill 月亮大至点）
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