当晚的月亮的确是弯月. 发光体是圆形,是因为拍摄的摄影头长时间暴光所致 根据CFHT 的资料, The Cloud Camera is a high sensitivity camera mounted to the catwalk of CFHT. The purpose of the camera is to take pictures of clouds and other weather at night, even on moonless nights. It does so in color, at a field of view comparable to a human eye and at an interval suffcient to see changes in the clouds (around 60 seconds). 每张图暴光约60秒