阿方索与阿尔扎赫尔环形山
2021年7月16日 Alphonsus and Arzachel Image Credit & Copyright: Noel Donnard Explanation: Point your telescope at tonight’s first quarter Moon. Along the terminator, the shadow line between night and day, you might find these two large craters staring back at you with an owlish gaze. Alphonsus (left) and Arzachel are ancient impact craters on the nort...