Solargraphic 8字曲线
(原标题: Solargraphic Analemmas)
2022-07-02
浏览次数: 49
对北半球来说，6月21日是夏至，太阳到达一年中最北的赤纬。当它穿过波兰普罗博什佐夫村的白天天空时，它将位于这三个8字形曲线或八字曲线的顶端。虽然没有使用数字曝光序列来构建引人注目的图像。在2021年6月26日至2022年6月26日期间，使用固定朝南的针孔相机，将图像直接形成在一张相纸上，这种技术被称为太阳照相术。这三条八字曲线是每天在欧洲中部时间11:00、12:00和13:00通过针孔短暂曝光相纸的结果。两侧的虚线组表示每15分钟每日曝光的太阳的部分轨迹。在长达一年的太阳照相机会中，在针孔曝光期间，云层阻挡了太阳，形成了黑暗的缝隙。
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For the northern hemisphere June 21 was the summer solstice, the Sun reaching its northernmost declination for the year. That would put it at the top of each of these three figure-8 curves, or analemmas, as it passed through the daytime sky over the village of Proboszczow, Poland. No sequence of digital exposures was used to construct the remarkable image though. Using a pinhole camera fixed to face south during the period June 26, 2021 to June 26, 2022, the image was formed directly on a single sheet of photographic paper, a technique known as solargraphy. The three analemmas are the result of briefly exposing the photo paper through the pinhole each day at 11:00, 12:00, and 13:00 CET. Groups of dashed lines on the sides show partial tracks of the Sun from daily exposures made every 15 minutes. Over the year-long solargraphic photo opportunity clouds blocking the Sun during the pinhole exposures created the dark gaps.
© Pinholove