國立自然科學博物館

離地面400公里的軌道高度，讓史上最大的人造天體，只剩下人眼分辨力極限的大小。原以為會忽略它，卻在飛越過地球與月球之間發現，原來還是那麼大！從地面目視的視角，看見該天象的範圍只有幾公里寬，通常須橫越幾個縣市才能看見；若要看清枝微末節，請使用口徑大的望遠鏡。對天文觀測來說，口徑一直是王道。國際太空站為了維持軌道高度，必須以每1.5小時環繞地球一周的高速飛行。忙了大半天，最終的決戰時刻只有僅僅0.5秒。

The largest habitable artificial satellite in human history is in low earth orbit at about 400 km in altitude. Its size should be just discernible to the naked eye on the earth and easily missed. However, when I discovered it passing between the earth and the moon, I had no idea it was so huge! Viewed from the earth, it appears only a few kilometers away. Usually it requires traveling over several counties and cities to see. To observe it more clearly, it is best to use a large caliber telescope. For astronomical observations, caliber is always very important. To maintain its orbit, the International Space Station must circle the earth once every 1.5 hours. After busily preparing for most of the day, this scene lasted for about 0.5 sec.

顏鴻選-國際太空站凌月1