锡拉库萨后方的超级蓝月

2023年9月5日

Blue Supermoon Beyond Syracuse
Credit & Copyright: Kevin Saragozza

Explanation: The last full moon was doubly unusual. First of all, it was a blue moon. A modern definition of a blue moon is a second full moon to occur during one calendar month. Since there are 13 full moons in 2023, one month has to have two — and that month was August. The first full moon was on August 1 and named a Sturgeon Moon. The second reason that the last full moon was unusual was because it was a supermoon. A modern definition of supermoon is a moon that reaches its full phase when it is relatively close to Earth — and so appears a bit larger and brighter than average. Pictured, the blue supermoon of 2023 was imaged hovering far behind a historic castle and lighthouse in Syracuse, Sicily, Italy.

Gallery: Selected August 2023 supermoon images submitted to APOD

Tomorrow’s picture: sky in motion

锡拉库萨后方的超级蓝月
影像提供与版权: Kevin Saragozza

说明: 上个满月有双重不寻常之处。首先，它是蓝月。依现代的定义，蓝月是指同一个阳历月份里的第二轮满月。因为2023年有13个满月，所以必然有某个月会出现2个满月，而八月就是这样的月份。出现在8月1日的第一个满月，亦有鲟鱼月之称。而上个满月的第二个不寻常之处，在于它是一轮超级月亮。现代所谓的超级月亮，是指满相出现在近地点附近的月亮，因此外观上比寻常满月要大一些也亮一些。上面影像所呈现的，是低悬在意大利西西里岛锡拉库萨市一座历史悠久的城堡和灯塔后方的2023年超级蓝月。