日晕

2021年06月10日

Circular Sun Halo
Image Credit & Copyright: Vincenzo Mirabella

Explanation: Want to see a ring around the Sun? It’s easy to do in daytime skies around the world. Created by randomly oriented ice crystals in thin high cirrus clouds, circular 22 degree halos are visible much more often than rainbows. This one was captured by smart phone photography on May 29 near Rome, Italy. Carefully blocking the Sun, for example with a finger tip, is usually all that it takes to reveal the common bright halo ring. The halo’s characteristic angular radius is about equal to the span of your hand, thumb to little finger, at the end of your outstretched arm. Want to see a ring of fire eclipse? That’s harder. The spectacular annular phase of today’s (June 10) solar eclipse, known as a ring of fire, is briefly visible only if you’re standing along the Moon’s narrow shadow track that passes over parts of northern Canada, Greenland, the Arctic, and eastern Russia. The solar eclipse is partial though, when seen from broader regions, including northern Asia, Europe, and parts of the US.

Tomorrow’s picture: shadow play

日晕
影像提供与版权: Vincenzo Mirabella

说明: 想看环拱太阳的晕环吗？在世界各地的白昼天空中，它是轻易可见的景观。张角22度、远比彩虹还常见的环形日晕，是由薄薄高卷云内随机排列的冰晶所造成的。上面这幅来自手机相机的日晕影像，则是在5月29日摄于义大利的罗马附近。要让明亮的晕环显现，其实只要仔细遮住日盘即可，例如这幅影像里的指尖。晕环的特征半径，大约与手伸长时，拇指到小指头的手掌张角相当。想看有火之环景观的日食吗？这稍难一些。在今天（6月10日）的日食里，名为火之环的精采环食阶段，只有位在通过北加拿大、格陵兰、北极区、东俄罗斯的窄窄月影带内的住民才得见。不过在更辽阔的区域，包括在北亚、欧洲和部分美国的住民，可见到日偏食。

明日的图片: shadow play