2b. GOPR1412 copy.MP4

Visualization 1 Caption: Time lapse video of antisolar twilight development. Field of View (FOV) of each frame is 118° x 69°. The view is westward over the Pacific Ocean and it was cold and clear at sunrise. Refracted solar altitude ε is shown in each frame. The video was taken in the time-lapse mode with a 2 second frame interval. When played back at 30 frames/sec, time compression was 60:1, resulting in 1 second of video time = 1 minute of real time. The video was taken with a GoPro Hero 4 Black on Dec 31, 2015 from Oceano Dunes State Vehicular Recreation Area (35.106070, -120.630673) near Pismo Beach, CA.可视化1 说明文字：反曙暮辉（antisolar twilight）演化的延时摄影视频。每帧视场角（Field of View，FOV）为118°×69°，拍摄视角向西朝向太平洋，拍摄时为日出时分，天气寒冷晴朗。每帧画面均标注了折射太阳高度角ε。该视频采用延时摄影模式拍摄，帧间隔为2秒。当以30帧/秒的速率回放时，时间压缩比为60:1，即视频中1秒对应实际时长1分钟。该视频于2015年12月31日使用GoPro Hero 4 Black相机拍摄，拍摄地点位于加利福尼亚州皮斯莫海滩附近的奥西亚诺沙丘州立车辆游乐区（35.106070, -120.630673）。