ten o'clock
From the outside of a house , when it is light , one can not see what is going on in a dark room . This question Count Vavel was given an opportunity to decide . The astronomical calendar had announced a total eclipse of the moon on a certain night in July . The moon would enter the shadow at ten o'clock , and reach full obscuration toward midnight . Ludwig had persuaded Marie to observe the phenomenon with him ; and the young girl was astonished beyond measure when she beheld for the first time the full moon through the telescope . Ludwig explained to her that the large , brilliant circles were extinct craters ; the dark blotches , seas . At that time scientists still accepted the theory of oceans on the moon .