时长越来越长的白昼


   2019-06-27 丨 天文·每日一图 丨 nasachina  丨  No Comment 丨  97

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2019 June 27

时长越来越长的白昼
影像来源及版权:
Gianluca Belgrado

说明:这幅持续拍摄六个月的长曝光影像将从冬至到夏至(2018年12月21日至2019年6月16日)的时间压缩成一个单一的视角。这幅不寻常的影像被称为日轨图,它是由一台高大的管状针孔相机、通过使用一张照相纸拍摄而成。这台简易的相机被固定在意大利.卡萨拉诺的一个单一地点上,并连续不断地记录太阳的日常路径,就像一道炽热的轨迹在感光纸上燃烧一样。这些轨迹上的中断和缺口是由云层造成的。在曝光结束时,我们对纸张进行扫描从而构建出这幅数字影像。当然,从12月开始,太阳轨迹会在临近北半球冬至时落在天空中的较低处。随着白昼时长的增加和6月21日夏至的来临,太阳轨迹会越升越高。

The Longer Days
Image Credit & Copyright:
Gianluca Belgrado

Explanation: This persistent six month long exposure compresses the time from solstice to solstice (December 21, 2018 to June 16, 2019) into a single point of view. Dubbed a solargraph, the unconventional picture was recorded with a tall, tube-shaped pinhole camera using a piece of photographic paper. Fixed to a single spot at Casarano, Italy for the entire exposure, the simple camera continuously records the Sun's daily path as a glowing trail burned into the photosensitive paper. Breaks and gaps in the trails are caused by cloud cover. At the end of the exposure, the paper was scanned to create the digital image. Of course, starting in December the Sun trails peak lower in the sky, near the northern hemisphere's winter solstice. The trails trails climb higher as the days grow longer and the June 21st summer solstice approaches.

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