北京古天文台上空的星迹
(原标题: Startrails over Beijing Ancient Observatory)
2023-12-02
浏览次数: 16
你可以乘地铁去中国北京参观这个天文台，但你在那里找不到任何望远镜。从15世纪开始，天文学家就在北京古代天文台的遗址上安装了设备，使他们能够准确地测量和跟踪肉眼可见的恒星和行星的位置。一些大型的、华丽的天文仪器仍然矗立着。今天，你甚至可以从观星平台上看到星星，但现在只有在城市的灯光下才能看到最亮的天体信标。在这个时间序列的曝光中，相机固定在三脚架上，记录优雅的弧形星迹，最亮的轨迹实际上是月亮。在古代天文台的黄铜浑天仪后面可以看到它宽阔的弧形。将这张摄于2023年9月的北京古天文台的照片与1895年拍摄的照片进行比较。
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You can take a subway ride to visit this observatory in Beijing, China but you won't find any telescopes there. Starting in the 1400s astronomers erected devices at the Beijing Ancient Observatory site to enable them to accurately measure and track the positions of naked-eye stars and planets. Some of the large, ornate astronomical instruments are still standing. You can even see stars from the star observation platform today, but now only the very brightest celestial beacons are visible against the city lights. In this time series of exposures from a camera fixed to a tripod to record graceful arcing startrails, the brightest trail is actually the Moon. Its broad arc is seen behind the ancient observatory's brass armillary sphere. Compare this picture from the Beijing Ancient Observatory taken in September 2023 to one taken in 1895.
© Jeff Dai