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月亮上的直壁 , 在月亮南部山區與雲海的交界 , 有一道長120 km (10個香港島由東至西的距離 ), 高30到40 km , 從前認為它是個懸崖峭壁 , 後來的觀測證實它應是個傾斜約15度的大斜坡 . 圖中還見月溪 Rupes Recta, 及西北區的皺摺平原 .
Straight Wall : length 120 km, height 30~40 km, with Rupes Recta on Southern Part of The Moon , 2015/04/27 HKT: 20h03m,
Telescope TEC Maksutov-Cassegrain MC200/20, D=20cm, F.L.=400cm, Prime Focus, Losmandy G-11 Equatorial Mount with motor drive. Camera ASI 120MC CMOS Web Cam, Shoot at 20 frames/sec, stack and process 1040 frames with Software RegiStax V5 . Atmospheric Transparent : 8/10, Seeing : 7/10. Equipment borrowed from H.C.Ng. Taken at Kennedy Town, Hong Kong.
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