美国国家航空航天局NASA每日一图(天文)-2017年6月23日

2017 June 23

Solstice Conjunction over Budapest
Image Credit & Copyright: György Soponyai
Explanation: Before a solstice Sun rose on June 21, brilliant Venus and an old crescent Moon posed together over Budapest, Hungary for this predawn skyscape. In the foreground the view looks across the Danube river from Buda to Pest toward the dome and peaks of the Hungarian Parliament building. Low clouds are in silhouette against a twilight sky. But far enough above the eastern horizon to catch the sunlight shines another seasonal apparition on that solstice morning, noctilucent clouds. Seen near sunrise and sunset in summer months at high latitudes, the night-shining clouds are formed as water vapor in the cold upper atmosphere condenses on meteoric dust or volcanic ash near the edge of space.

2017年6月23日

在布达佩斯形象信用与版权的冬至结合:GYörgy Soponyai

解说:在冬至的太阳升起之前,灿烂的金星和一个古老的新月在匈牙利的布达佩斯一起为黎明前的skyscape而战。在前景中,这幅风景从Buda到害虫的穹顶,到匈牙利议会大厦的圆顶和山峰。朦胧的天空衬托出云的影子。但远在东方地平线上的阳光照射下,在那个冬至的清晨,又出现了一个季节性的幽灵,夜光的云朵。附近见过日出和日落在高纬度地区的夏季,晚上,夜光云是在寒冷的高层大气中的水汽凝结形成对大气尘埃或空间的边缘附近的火山灰。

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