This photograph is a 20-minute exposure ending just before the main Leonids peak began.
上面是曝光时间是20分钟的照片，在狮子座流星主群出现之前。
The main central peak and two side peaks are important in the tracking mechanism.
此中心主峰值和两个副峰值对于轨道跟踪机构很是重要。
The main central peak and two side peaks are important in the tracking mechanism.
此中心主峰值和两个副峰值对于轨道跟踪机构很是重要。
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