意大利的行星排列
(原标题: Planetary Alignment over Italy)
2021-12-19
浏览次数: 4
行星排成一行并不是巧合。这是因为所有的行星都在（几乎）一个叫做黄道面的单面上绕太阳运行。当从这个平面内观察时——就像地球上的居民可能做的那样——所有的行星似乎都局限在一个波段内。然而，当三颗最亮的行星几乎都出现在同一个方向时，这是一个巧合。这种巧合在本月早些时候被捕捉到了。上面的特色（从右到左），金星、土星和木星都是在日落之后在意大利贝加莫的圣费默山拍摄的。地球的月亮和更远的天王星也加入了这一行列。一缕缕云彩划过天空，朝向夕阳。随着伦纳德彗星的消失，这种没有月球的行星排列应该会持续到本月余下的时间。探索+拓展：APOD研究生研究职位开放
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It is not a coincidence that planets line up. That's because all of the planets orbit the Sun in (nearly) a single sheet called the plane of the ecliptic. When viewed from inside that plane -- as Earth dwellers are likely to do -- the planets all appear confined to a single band. It is a coincidence, though, when three of the brightest planets all appear in nearly the same direction. Such a coincidence was captured earlier this month. Featured above (right to left), Venus, Saturn, and Jupiter were all imaged together in a line just after sunset, from the San Fermo Hills, Bergamo, Italy. Joining the alignment are Earth's Moon, and the position of the more distant Uranus. Bands of clouds streak across the sky toward the setting Sun. As Comet Leonard fades, this planetary alignment -- absent the Moon -- should persist for the rest of the month. Discovery + Outreach: Graduate student research position open for APOD
© Antonio Finazzi